0672326094_chapter_8

8/3/2019 0672326094_chapter_8

1/21

Rand H. Morimoto, MC

Andrew Abbate, MC

Eric Kovach, MC

Ed Roberts, MVP (Windows Serv

800 East 96th Street, Indianapolis, Indiana 46240

Windows

Server 2003

Microsoft
http://www.samspublishing.com/bookstore/product.asp?isbn=0672326094

8/3/2019 0672326094_chapter_8

2/21

8Administering

Windows

Server 2003

Remotely

There are several methods by whichsystem administrators can manage the IT

environments server resources. Though it is

possible to manage each server locally,

managing these resources remotely can

greatly improve productivity. Remote

administration reduces the administrative

overhead required to manage servers in any

size IT organization because it provides theflexibility for administrators to be centrally

located while managing distributed server

resources.

Windows Server 2003 provides the tools

necessary for administrators to perform a

vast array of management functions on

remotely located servers. Server application

and operating system upgrades can be

performed remotely, as well as domain

controller promotion/demotion and disk

defragmentation.

This chapter describes the tools available for

administrators to manage Windows Server

2003 servers remotely and provides best

practices for leveraging remote administra-

tion features.

IN THIS CHAPTER

Using Remote Desktop forAdministration

Taking Advantage of Windows

Server 2003 Administration Tools

Using Out-Of-Band Remote AdministrationTools for Emergency Administration

Using and Configuring RemoteAssistance

Securing and Monitoring Remote

AdministrationDelegating Remote Administration

Administering IIS in Windows Server2003 Remotely

BEST PRACTICE

bootcfg.exe Syntax

Presented by:

Reproduced from the book Microsoft Windows Server 2003 Insider Solutions. Copyright 2004, Sam

Publishing. Reproduced by permission of Pearson Education, Inc., 800 East 96th Street, Indianapolis, IN

Written permission from Pearson Education, Inc. is required for all other uses.
http://www.samspublishing.com/bookstore/product.asp?isbn=0672326094http://www.samspublishing.com/bookstore/product.asp?isbn=0672326094http://www.samspublishing.com/bookstore/product.asp?isbn=0672326094http://techrepublic.com.com/

8/3/2019 0672326094_chapter_8

3/21

Using Remote Desktop for Administration

Remote Desktop for Administration is one mode of the Terminal Services built into Windows

Server 2003. Terminal Services can be enabled in one of two ways:

n Terminal Server mode. This is the Application Server mode that was available in Windows2000 Server.

n Remote Desktop for Administration. This is an enhancement of the Remote

Administration mode of Windows 2000 Server.

This second Terminal Services mode is used to administer Windows Server 2003 servers remotely.

Remote Desktop for Administration provides remote access to the graphical interfacebased tools

available in the Windows environment. Remotely managing servers with Remote Desktop for

Administration does not affect server performance or application compatibility.

Unlike the other terminal service mode, no terminal server Client Access Licenses (CALs) are

required to use Remote Desktop for Administration. Windows Server 2003 provides two remoteadministrative sessions, for collaborative purposes, and a console session.

Enhancements to Remote Administration with Remote

Desktop Connection

By taking advantage of the new Terminal Services client, known as the Remote Desktop

Connection (RDC), remote administration is enhanced in Windows Server 2003 in several ways.

The RDC supports a wide selection of hardware devices, so servers can be managed remotely from

several different types of client hardware. The RDC is supported on the following hardware types:

n

16-bit Windows-based computers running Windows for Workgroups with TCP/IP.n 32-bit Windows-based computers running every Windows OS from Windows 95 to

Windows Server 2003.

n Windows CE-based handheld devices.

n Windows CE-based terminals, or thin clients.

The RDC allows for automatic restoration of interrupted network connections. This is key for

remote administration. In the event that an administrator is disconnected in the middle of a

mission-critical operation, the RDC will reconnect the session without losing the administrators

place in the operation.

The RDC supports a great deal of customization for the look and feel of a remote session. Providinghigh color, audio, and full screen sessions, the RDC allows you to control the graphic options and

connection speed. This is an important feature because as you connect remotely to servers over a

slow WAN link you will want to throttle the bandwidth usage for those particular sessions.

One of the biggest improvements to the RDC involves client resource redirection, which is avail-

able to Windows Server 2003 and Windows XP. You now have the capability to access local drives,

network drives, and printers through the remote connection. Cut and paste, as well as large file

transfers, can be accomplished between the client and server in a remote administration session.

8Administering Windows Server 2003 Remotely

164

8/3/2019 0672326094_chapter_8

4/21

Using Remote Desktop for Administration

Finally, in addition to the two remote sessions available for remote administration, Windows

Server 2003 allows a console mode that enables you to connect to the real console of the

server. Now administrative functions, such as some software installations that previously

required local interaction, can be performed remotely.

Enabling Remote Desktop for Administration

Enabling Remote Desktop for Administration is a simple procedure. Unlike Windows 2000, the

Remote Desktop for Administration feature is now a separately configurable component from

Terminal Services and has some new flexibil-

ity options previously unavailable.

The Remote Desktop for Administration

feature is actually installed by default in

Windows Server 2003, but it is installed in a

disabled status for security reasons. To enable

the feature with a default Start menu configu-ration, perform the following steps:

1. From the Control Panel, double-click the System icon.

2. Choose the Remote tab.

3. On the bottom of the screen, click the check box to Allow Users to Connect Remotely to

your computer, as shown in Figure 8.1.

4. Click OK to complete the configuration.

The default level of encryption forremote sessions

The default level of encryption for remote

sessions is bidirectional 128-bit. Some older

terminal service clients might not support

128-bit encryption.

FIGURE 8.1 Enabling Remote Desktop for

Administration.

8/3/2019 0672326094_chapter_8

5/21

If the Windows Server 2003 will be accessed remotely from a terminal server client that does not

support high encryption, the encryption level of the remote session can be set to Client

Compatible. This encryption level will provide the highest level of encryption to the remote

session supported by the client. To change the default encryption level on the server to Client

Compatible, follow these steps:

1. Open Terminal Services Configuration from All Programs\Administrative Tools.

2. In the right pane, under the Connection column, right-click RDP-Tcp, and choose

Properties.

3. Set the encryption level to Client Compatible, as shown in Figure 8.2, and click OK to

complete the configuration.


166

FIGURE 8.2 Setting the encryption level forRemote Administration.

Best Practices for Remote Desktop for Administration

Understanding the following aspects of remote administration will enable system administrators

to make the best use of the new Remote Desktop for Administration features in Windows

Server 2003:

Use the Console ModeWith the new console mode of connection available in Windows Server 2003, you can interact

with the remote server as if you are directly at the physical server. This enables you to see pop-

ups and messages that might only appear at the console.

Configure Disconnect and Reset Timeouts

By default, disconnect and reset timeouts are not set. This has the potential to lock you out of

remote sessions if there are two remote sessions that are active but in a disconnected state. On

8/3/2019 0672326094_chapter_8

6/21

Taking Advantage of Windows Server 2003 Administration Tools

the flip side, when configuring the timeouts,

allow enough time so that accidental discon-

nections can be resumed without resetting

the session. By default, when a connection is

broken, the session goes into a disconnected

state and continues to execute whatever

process it is running at that time. If the

session is configured to reset when the connection breaks, all processes running in that session

will be abruptly stopped. Disconnect and reset timeouts can be configured using the Terminal

Services Configuration Administrative tool.

Coordinate Remote Administration

With Windows Server 2003, administrators are able to collaborate through multiple remote

sessions. This feature has potential problems, though, if two administrators are unknowingly

connected remotely to the same server. For instance, server data might be lost if two administra-

tors attempt to perform disk defragmentation from two remote sessions at the same time.

Distinguish Terminal Services from Remote Administration

Although administrators have the capability to install software through a Remote Desktop for

Administration session, Terminal Services running in Terminal Server mode provides better

installation and environment settings for office applications. For general desktop and remote

application access functionality, use a dedicated Terminal Server solution.

Taking Advantage of Windows Server 2003

Administration Tools

Another method for remote administration of servers from a client desktop computer is avail-

able by installing the Windows Server 2003 Administration Tools Pack on a workstation running

Windows XP Professional Workstation. The primary target of administration for the

Administration Tools Pack is the remote management of Active Directory. The Windows Server

2003 Administration Tools Pack includes Microsoft Management Console (MMC) snap-ins,

Active Directory administrative tools, and other tools that are used to manage computers

running Windows Server 2003.

Installing the Admin Pack

The Windows Server 2003 Administration Tools Pack is included in the i386 folder on theWindows Server 2003 installation media. Once installed, you can run administrative tasks

remotely on Active Directory using the Active Directory tools that are automatically installed on

domain controllers. The tools only install on a computer running Microsoft XP Professional

with Service Pack 1 applied to the operating system.

Preventing Eavesdropping

For security purposes, when you are using the

console mode of remote administration, the

physical console of the server is automati-

cally locked to prevent eavesdropping.

8/3/2019 0672326094_chapter_8

7/21

Installing the administrative tools requires local administrative access on the workstation.

Running the tools requires the following:

n Administrative privileges in Active Directory.

n Network access to a domain controller in a Windows Server 2003 domain.

n Domain membership of the Windows XP Professional workstation in the Windows Server

2003 domain.

To install Windows Server 2003 Administrative Tools on a local Microsoft XP workstation,

follow these steps:

1. Insert the Windows Server 2003 CD-ROM

and browse to the i386 folder.

2. Double-click Adminpak.msi.

3. Click Next, and then click Finish.

When installing the Windows Server 2003

Administration Tools on a Windows XP work-

station, it is a best practice to also install the

Windows Server 2003 help files. On a

Windows XP workstation, by default, there is

only the Windows XP help. If the workstation

is intended to be an administrators remote

console, the Windows Server 2003 help files

should be locally available.

Again, installing the Windows Server 2003 help files can only be installed on Windows Server 2003

servers and Windows XP Professional SP1 workstations.

The Windows Server 2003 help files can be installed on an XP workstation from either the

installation media or over the wire from a Windows Server 2003 server. To install the help files

from the install media, perform the following steps on the workstation:

1. Click Start, and then click Help and Support.

2. In Help and Support Center, click the Options button.

3. Under Options, click Install and Share Windows Help.

4. Choose Install Help Content from a CD or Disk Image.

5. Browse to the CD, and click the Find button.

6. Click the Install button.


168

Not Mutually Compatible

The Administration Tools Pack for Windows

Server 2003 and Windows 2000 are not

mutually compatible. To administer Windows

2000 domains, use the Windows 2000 Tools.

To administer Windows Server 2003 domains,

use the Windows Server 2003 tools.

Although the Windows Server 2003

Administration Tools Pack can be used to

manage 64-bit Windows Server 2003 servers,

it cannot be installed on a computer running

a 64-bit version of the operating system.

8/3/2019 0672326094_chapter_8

8/21

Taking Advantage of Windows Server 2003 Administration Tools

Using Convenience Consoles

To ease delegation of administrative functions, the Windows Server 2003 Administration Tools

Pack includes Convenience Consoles that group specific tools into functional groups. The

administrative tools in the Tools Pack can be roughly classified into four categories:

n System Administration

n Network Administration

n Storage Management

n Directory Services Administration

Basically, the Convenience Consoles are customized MMCs that contain tools and MMC snap-

ins that fall into related groups. The MMCs are included in the installation and appear in the

Administrative Tools program group of the XP Workstation. The consoles can be published to

administrative workstations for administrators who have been delegated permissions in the

given category. There are three Convenience Consoles included in the Tools Pack:

n Active Directory Management. This console includes Active Directory Users and Computers,

Active Directory Sites and Services, Active Directory Domains and Trusts, and DNS. The

file associated with this console is ADMgmt.msc.

n Public Key Management. This console includes Certification Authorities, Certificate

Templates, Certificates for Current User, and Certificates for Local Computer. The file

associated with this console is PKMgmt.msc

n IP Address Management. This console contains the DHCP, DNS, and WINS management

tools. The file associated with this console is IPAddrMgmt.msc.

Customizing Administration Consoles

The convenience provided in the administration consoles might be a good start for some IT

organizations wanting to delegate administrative tasks. Most companies, though, will want

further customization to the consoles, or will want to create completely new consoles to meet

the delegation needs of the organization.

For example, the Active Directory Management Convenience console can be customized to

include the Group Policy Management Console (GPMC) and remove the DNS snap-in.

Organizations might create a Storage Management console that includes Windows Clustering,

Network Load Balancing Clusters, and Remote Storage snap-ins.

If a custom console is created in an effort to delegate administration, the console should be

configured so that it cannot be modified once it has been deployed to delegated administrators.

To lock down the properties of a custom console, perform the following steps:

1. Click Start, click Run, type mmc path\filename.msc/a, and then click OK.

2. On the File menu, click Options.

8/3/2019 0672326094_chapter_8

9/21

3. In Console mode, choose User ModeLimited Access, Single Window.

4. Select the Do Not Save Changes to This Console check box, as shown in Figure 8.3, and

click OK.


170

5. When the custom console is closed, choose Yes to save changes.

Using Out-Of-Band Remote Administration Tools forEmergency Administration

All the methods for remote access to Windows Server 2003 servers discussed so far in this

chapter rely on what are considered in-bandconnections. In-band connections typically involve

connecting to the server directly through a network connection, and then using Terminal

Service or Remote Desktop to manage the server with tools provided by Windows Server 2003.

In-band connections are used with servers that are functioning normally. Out-of-bandconnec-

tions, on the other hand, refer to connections to a server that do not rely on a network connec-

tion, or a fully functioning server. Out-of-band remote administration is made available in

Windows Server 2003 Emergency Management Services (EMS) to enable you to connect to andrepair servers that are unavailable by in-band methods of connection.

Emergency Management Service (EMS)

Emergency Management Service (EMS) is a new feature available in Windows Server 2003 that

enables you to manage servers remotely that are not available through the normal (network)

connections. With EMS and appropriate server hardware equipped with supporting firmware,

FIGURE 8.3 Locking down a customconsole.

8/3/2019 0672326094_chapter_8

10/21

Using Out-Of-Band Remote Administration Tools for Emergency Administration

you can manage a server without the need for a keyboard, mouse, local monitor, or video

adapter. EMS uses text-mode communication only, which provides flexibility as to the means by

which servers are remotely accessed. These methods include serial connections, terminal

concentrators, and terminal emulators.

With the proper hardware and EMS configuration, out-of-band support is provided to theservers kernel components, the loader, setup, Recovery Console, and Stop errors. When the

server is up and running, EMS provides a text-mode management console called Special

Administration Console (SAC), which will be discussed later in this section.

If the server hardware supports it, EMS can be installed with the Windows Server 2003 operating

system. By enabling firmware console redirection in the systems BIOS before installing the OS,

EMS will be self-configured on installation. To enable EMS after the operating system is

installed, you can use the bootcfg.exe command with the /EMS switch in the command console.

For example, the following command enables EMS to use COM1 with a baud rate of 19200 on

the first boot entry ID:

Bootcfg.exe /EMS ON /PORT COM1 /BAUD 19200 /ID 1

bootcfg.exe Syntax

The syntax for the bootcfg.exe /EMS command is illustrated as follows:

BOOTCFG /EMS value [/S system [/U user [/P [password]]]]

[/PORT port] [/BAUD baudrate] [/ID bootid]

Parameter List:

/EMSs Value On, Off, or Edit

/S computer Specifies a remote computer

/U Domain\user Specifies user context

/P password Password for the user account

/PORT port Specifies the COM port to be used for redirection. Valid ports are

COM1, COM2, COM3, COM4, BIOSSET(EMS uses BIOS settings).

/BAUD baudrate Valid baudrates are 9600, 19200, 57600, 115200.

/ID Bootid Specifies the boot entry ID to add the EMS option. This is required

when the EMS value is set to ON or OFF.

BEST PRACTI

Configuring the Serial Connection for EMS

As indicated in the previous section, for EMS to manage Windows Server 2003, properly

designed hardware must be integrated and configured on the server. The server motherboard

should support Serial Port Console Redirection (SPCR). If it does not, the SPCR table will have to

be configured manually. The server firmware should also be able to release control of the serial

port to Windows Server 2003 once the operating system is started in order to take advantage of

8/3/2019 0672326094_chapter_8

11/21

most EMS functionality. Additional hardware,

such as a service processor that is independent

of the main server processor, will enhance EMS

functionality. If the server hardware includes a

service processor, console redirection should be

available. The firmware must also use the same

terminal conventions as EMS.

The serial port is the most common out-of-

band hardware interface because it provides

multiple methods of remote access, such as terminal concentrators and modems. By default,

EMS uses the first serial port (COM 1 at 3F8). It is important to verify that the motherboard

serial ports are enabled, and that no other device is using that resource. EMS and the Windows

debugger cannot share the same COM port.

The actual configuration of the serial port will depend on the firmware settings available for a

server. Some computers will enable user configuration, whereas others might simply have an

Enabled/Disabled setting. Best practices for hardware configuration with EMS are as follows:

n Enable the appropriate port and maintain the default setting. Because EMS works with

COM1 at 3F8 automatically in most cases, this should be the target configuration.

n Configure the port to use the highest baud rate available to the hardware. This will

provide the best performance and reduce slow text-mode processes.

n Use a null modem cable with the serial port connection.

n Select hardware and firmware that support VT-UTF8. This terminal environment provides

the best compatibility with EMS. Sending the proper command escape sequences are more

difficult in a telnet session using VT100 and V100+.

Special Administration Console (SAC)

The Special Administration Console (SAC) is the primary EMS command line environment

available to Windows Server 2003. The SAC is different from the typical command line environ-

ment, and provides functionality intended for out-of-band management scenarios.

When EMS is enabled, SAC is available as long as the Windows Server 2003 kernel is running.

SAC provides commands to perform the following management tasks:

n Restart or shut down the server.

n View and end active processes.

n View and set server IP address.

n Generate a stop error to create a memory dump.

n Start and access command prompts.


172

Terminal Conventions Supported by EMS

The terminal conventions supported by EMS

in Windows Server 2003 are VT100, VT100+,

and VT-UTF8. Using the same terminal

conventions in the server firmware, serviceprocessor, and client terminal ensures a

consistent environment for managing servers

in all states of operation (or failure).

8/3/2019 0672326094_chapter_8

12/21

Using and Configuring Remote Assistance

Because SAC enables you to access the command prompt, any text-based utilities usable in a

Telnet session are available (provided there are system resources to run them). For example, the

common communications accessory, HyperTerminal, can be used to access SAC on an EMS

enabled server, as shown in Figure 8.4.

FIGURE 8.4 Using HyperTerminal to accessthe SAC command line.

SAC includes command shell utilities, such as dir, and text-based console programs, such as

bootcfg.exe. Access to the command prompt requires a user logon with a local or domain

account.

If SAC fails or becomes unavailable, !Special Administration Console (!SAC) is enabled. The !SAC

is an auxiliary console environment hosted by Windows Server 2003 that has a subset of the

features available with SAC. With !SAC, you can redirect Stop error message text and restart

the server.


Remote Assistance is a feature that was introduced in Windows XP that enables a user on one

computer to remotely view and even take control of the desktop environment of another users

computer. The interaction between the two computers is initiated either through an invitation

or through an offer of assistance from one user to the other. For organizations that have

deployed Windows XP in their desktop environment, Remote Assistance is a valuable tool for

help desk departments. Many service calls that once required a visit to the end user to resolve a

problem can now be resolved interactively through a Remote Assistance session.

Carrying the functionality forward, the Remote Assistance tool is also available to Windows

Server 2003. Whereas Remote Assistance is a valuable tool for the help desk in a desktop envi-

ronment, it becomes a valuable collaborative tool for system administrators in the server envi-ronment. Using Remote Assistance, an administrator of one server can request or offer remote

assistance to an administrator of another server. The two administrators can then collaboratively

resolve server configuration issues in real time through the same GUI on the server in question

without having to be physically at the server.

This section describes how to configure and use the Remote Assistance tool to carry out collabo-

rative remote administrative sessions on Windows Server 2003 servers.

8/3/2019 0672326094_chapter_8

13/21

Requirements for Remote Assistance

To take advantage of Remote Assistance, both machines engaging in a collaborative session must

be running either the Windows XP or Windows Server 2003 operating system. Additionally,

both machines must be connected via a common network. What makes Remote Assistance so

flexible is that the common network can be the Internet.

If the collaborative session is initiated by one administrator sending an invitation to the other

administrator, the computer sending the invitation must be able to transfer a file. The file can

be transferred through e-mail, or automatically through the Help and Support Center, which

uses Outlook Express or Windows Messenger. The file can also be saved and transferred by any

other means of transferring a file.

If the collaborative session is initiated by an offer to assist, thus bypassing the invitation, then

both computers must be in the same domain or be members of two trusting domains.

Additional configurations are necessary for a machine to accept Remote Assistance offers, which

will be discussed later in the section.

To use Remote Assistance in Windows Server 2003, it must be enabled. For security purposes, it

is disabled by default. To enable Remote Assistance, perform the following steps:

1. Open the System applet in the Control Panel.

2. Go to the Remote tab, and click the check box to Turn on Remote Assistance and Allow

Invitations to be Sent from This Computer.

3. Click the Advanced tab, and enable the Remote Control feature and the invitation expira-

tion, as shown in Figure 8.5.


174

FIGURE 8.5 Configuring Remote Assistance.

Sending a Remote Assistance Invitation

This section steps through the process by which a collaborative session is initiated through an

invitation for Remote Assistance. The invitation can be sent in one of three ways:

n Using Windows Messenger. Windows Messenger is the preferred method for sending the

invitation for assistance because it provides additional ways for the two machines to find

each other over the Internet. If the two computers are on separate networks, separated by

firewalls, and/or use Network Address Translation (NAT), this is the method to use.

8/3/2019 0672326094_chapter_8

14/21


n Sending an e-mail. Remote Assistance

uses Simple Mail Advanced

Programming Interface (MAPI) to help

compose the invitation. The inviter or

Novice sends an e-mail to the invitee

or Expert with an attachment. When

the Expert opens the attachment, he is

prompted for a password, providing

that the Novice specified a password,

and the process continues.

n Saving and transferring a file. This

method is used if there is no compatible

MAPI client installed, or if other prerequisites are not available. This option enables the

Novice to save the same file that would be created and attached to an e-mail automatically

to be saved to her local drive or to a network share. The file can be transferred on a

network share, a floppy disk, or other means. When the Expert receives the file, he candouble-click it to open the invitation and start the Remote Assistance session.

To invite another administrator for Remote Assistance by sending a file, perform the following

steps:

1. Open Help and Support Center by clicking Start and then clicking Help and Support.

2. Under Ask for Assistance click Invite a Friend to Connect to Your Computer with Remote

Assistance.

3. Click Invite Someone to Help You.

4. Click Save Invitation as a File.

5. Specify the Inviters name, and an expiration time for the invitation, then click Continue.

6. Type in a password that will unlock the invitation, retype the password for confirmation,

and click Save Invitation.

7. Select a location accessible to the Expert to save the file.

8. When the Expert receives the invitation, the Expert is prompted for the password. After

supplying this password, the Expert can initiate the Remote Assistance session.

9. After the Expert initiates the session, the Novices computer verifies the password that the

Expert entered.10. The Novices computer also checks to make sure that the invitation that the Expert used is

a valid invitation and that the invitation is still open.

11. If the invitation is open and the password is correct, the Novice receives a notification

stating that the Expert wants to start the session now and the Novice is prompted to start

the Remote Assistance session.

Remote Assistance

If an e-mail client has not yet been config-

ured, Remote Assistance attempts to help the

Novice configure it. To change the e-mail

client that Remote Assistance uses, in ControlPanel, double-click Internet Options, and on

the Programs tab, change the e-mail setting

to the appropriate e-mail client. Some e-mail

clients that do not support Simple MAPI will

not appear as an option in the Internet

Options Control Panel program.

8/3/2019 0672326094_chapter_8

15/21

12. If the Novice chooses to start the session, the Remote Assistance Novice chat dialog box

will open on the Novices computer, as shown in Figure 8.6, and the Remote Assistance

Expert console opens on the Experts computer. At this point, the Expert can see every-

thing on the Novice computer, in real time.


176

13. The Expert can request to take control of

the Novices computer at this point by

clicking the Take Control button on the

Expert console. This sends a message to

the Novices computer notifying theNovice that the Expert is requesting to

take control of the computer.

14. When the collaborative session is

complete, the session can be ended by

the Novice or Expert by clicking the

Disconnect button.

Securing and Monitoring Remote Administration

Remote administration of servers is a valuable tool for distributed IT organizations. It is impor-

tant, though, when enabling remote administration features in Windows Server 2003, to main-

tain a high level of security for the server resources. Windows Server 2003 installs but disables

remote access features by default for security purposes. When enabling these features, ensure

that only administrators with the proper credentials will be able to remotely gain access to the

server. This section provides tips on securing and monitoring remote administration.

FIGURE 8.6 Establishing a RemoteAssistance session.

After the Expert Takes Control

After the Expert takes control, the Remote

Assistance session responds to both users

inputs. As a result, the mouse might behave

erratically if both the Expert and Novice are

attempting to control the session. If the Novice

stops control, the Remote Assistance session

continues and the Expert can still see the

Novices desktop.

8/3/2019 0672326094_chapter_8

16/21

Securing and Monitoring Remote Administration

Securing Remote Administration

The security implications of enabling remote administration are fairly obvious. With remote

administration features enabled, users who log on remotely can perform tasks as if they were

sitting right in front of the server. Depending on the role the server plays in the organization,

unauthorized access to a server can jeopardize a companys entire business. For this reason, it isimportant to protect the server from unauthorized access. Part I of this book, Security Solutions,

provides detailed approaches to securing Windows Server 2003. The following checklist points out

key items to keep in mind for servers with remote administration features enabled:

n Depending on the topological location of the server, firewall technologies can be used to

protect the server. Some servers, such as VPN and Web servers, are more prone to attack

due to their topological proximity to the Internet. As such, firewalls should be deployed

and properly configured to filter network traffic to and from such servers.

n Enable IPSec. IPSec policies provide both the strength and flexibility to protect communi-

cations between private network computers, domains, sites, remote sites, extranets, and

dial-up clients. It can even be used to block receipt or transmission of specific traffic types.With an Active Directory domain, IPSec policies can be enforced using Group Policy.

n Require all users who make remote connections to use strong passwords. The role that

passwords play in securing an organizations network is often underestimated and over-

looked. Passwords provide the first line of defense against unauthorized access to the

server. Password-cracking tools continue to improve, and the computers that are used to

crack passwords are more powerful than ever.

n Limit the users who can log on to the server remotely. You can leverage security templates,

or group policies to limit whom can connect to a server through Terminal Services. The

setting Allow Logon through Terminal Services can be found in the Group Policy Editor by

navigating to Computer Configuration\Windows Settings\Security Settings\LocalPolicies\User Rights Assignment.

n Always password-protect Remote Assistance. A Remote Assistance invitation that has no

password associated with it might be intercepted by an attacker, giving him the capability

to remotely interact with a server. For this reason, it is also important to set an expiration

time on the invitation.

Monitoring Remote Administration

Proper auditing practices go hand-in-hand with any good security policy. The Terminal Services

Manager tool can be used to view and interact with remote connections in real time, but this is

only helpful to view a servers current status. It is important to maintain and review the security

logs of servers, as well as set up the proper items to monitor for events that occur when you are

not actively watching for remote connections.

Auditing policies can be enforced on a server-by-server basis by applying security templates

through the Security Configuration and Analysis MMC snap-in. In an Active Directory environ-

ment, auditing policies can be applied by group policy, as shown in Figure 8.7.

8/3/2019 0672326094_chapter_8

17/21

For servers enabled for remote administration, it is important to audit the success and failure of

logon events, account management, policy changes, and system events. Also, failure of privi-

leged use events should logged.

Delegating Remote Administration

Perhaps the easiest way to control who has access to log on remotely to a server is to modify the

built-in Remote Desktop Users group. By default, the security settings on Windows Server 2003servers limits remote access to administrators and the Remote Desktop Users group.

To extend this security by limiting what a user can do after a remote session has been estab-

lished to a server, you can delegate administration in Windows Server 2003. By delegating

administration, a wide range of administrative tasks can be assigned to the appropriate users

and groups. You can assign basic administrative tasks to regular server admin groups, and leave

domainwide and forestwide administration to members of the Domain Admins and Enterprise

Admins groups.

You can delegate administration by using either the Delegation of Control Wizard or the

Authorization Manager MMC snap-in. The Delegation of Control wizard walks you through a

series of steps to execute the process. The Authorization Manager provides a bit more flexibility,but with a lot more complexity. The Delegation of Control Wizard is detailed in Chapter 4,

Distributing Administration.


178

FIGURE 8.7

Setting up an audit policyin group policy.

8/3/2019 0672326094_chapter_8

18/21

Administering IIS in Windows Server 2003 Remotely


There are three different options available in Windows Server 2003 to manage Web services

provided by Internet Information Services remotely: using the Internet Information Services (IIS)

Manager, using Terminal Services, and using the Remote Administration (HTML) tool. Choosingthe correct option depends on the type of administration necessary, the network connection,

and the type of client machine from which the administrator is working. This section describes

the different remote administration options for Web server administrators and defines the

scenarios in which each method is appropriate.

Using Internet Information Services Manager (IIS)

Internet Information Services Manager is the default tool by which Web services are adminis-

tered on a Web server. In addition to managing the Web services on a local server, this adminis-

trative tool can be configured to connect to other servers running IIS. It is important to keep in

mind that the IIS Manager should be used to remotely connect to Web servers available on theintranet, not on the Internet.

Windows Server 2003 provides a completely reworked version of IIS: version 6. Although there

are many new features available in IIS 6.0, the manager tool installed with the Web service

supports the management of down-level versions of IIS. So, in addition to providing remote

administrative functionality to servers running IIS 6.0, the IIS Manager also can remotely

connect to and manage Web servers running IIS 5.1 and 5.0.

To use the Internet Information Services Manager to manage a Web server remotely, follow these

steps:

1. On the IIS 6.0-based server, click Start, point to Administrative Tools, and then click

Internet Information Services Manager.

2. Click on the Action menu, and choose Connect.

3. In the Computer Name box, type the

computer name of the remote Web

server, and then click OK. It is also

possible to enter the IP address of the

Web server, as shown in Figure 8.8.

4. The remote computer is displayed under

Internet Information Services (IIS) in

the tree pane.

It Might Not Be Possible to Connect to anIIS Computer

If TCP/IP and a name resolution server such

as Windows Internet Naming Service (WINS)

are not available, it might not be possible to

connect to an IIS computer by using the

computer name.

8/3/2019 0672326094_chapter_8

19/21

Using Terminal Services

If Remote Desktop for Administration is enabled on the Web server, you can connect to and

administer IIS using the RDP client. Just as the previous method of connecting to a Web server

with IIS Manager provided down-level support to Web servers that are not running IIS 6.0, the

terminal service method of remote administration provides an up-level mode of administration.

So, the client workstation from which the remote connection is made can administer IIS 6.0from any operating system that supports the terminal service client. In addition to using

Windows Server 2003, the client machine can be Windows 98, NT 4.0, XP, or 2000.

To remotely administer an IIS server with terminal services, simply follow these steps:

1. On a computer on which the Terminal Services client is installed, start the Terminal

Services client.

2. Connect to the remote IIS-based computer.

3. From the Terminal Services Client window, administer IIS as if logged on to the computer

locally. For example, click Start, point to Administrative Tools, and then click Internet

Information Services Manager to start the Internet Information Services Manager.

Using the Remote Administration (HTML) Tool

To manage Web servers through a Web browser, you can configure and use the Remote

Administration (HTML) tool. Though this tool does not offer the full feature set of the Internet

Information Services Manager, you can perform most Web and FTP site management tasks with

the added flexibility of accessing your servers from the Web.

The Remote Administration (HTML) Tool provided with Windows Server 2003 IIS is not back-

wards compatible. In other words, it cannot be used to manage IIS 5.0 or 5.1; it will only work

with IIS 6.0.

The HTML tool is not enabled by default when IIS 6.0 is installed. Also, depending on how IIS

was installed on the server, the HTML tool might need to be added before it can be used. To add

the HTML tool to an existing IIS server, perform the following steps:

1. From the Control Panel, run Add or Remove Programs.


180

FIGURE 8.8 Remotely managing an IISserver.

8/3/2019 0672326094_chapter_8

20/21


2. Choose Add/Remove Windows Components.

3. Navigate to Application Server\Internet Information Services\World Wide Web Services

and then choose Remote HTML Administration. Click the OK button three times for

dialog prompts and then click Next.

4. Insert the Windows Server 2003 installation media when prompted.

5. When the installation completes, click Finish.

After the HTML tool is installed, the remote administration functionality must be enabled in

Internet Information Services Manager. To maintain a high level of security for the Web server,

it is important to restrict remote access to the server to a select IP address or group of IP

addresses from which the server can be remotely administered. In the following example, a Web

server will be enabled for remote administration, but will be configured so that only a computer

with an IP address of 192.168.20.20 will be able to remotely administer IIS for that server. To

enable the HTML remote administration tool, perform the following steps:

1. Click Start, point to Administrative Tools, and then click Internet Information Services

Manager.

2. Expand ServerName, where ServerName is the name of the Web server, and then expand

Web Sites.

3. Right-click Administration and then click Properties.

4. Under Web Site Identification, record the numbers that are displayed in the TCP Port box

and SSL Port boxes. The defaults are 8099 and 8098.

5. Click the Directory Security tab, and then click the Edit button under IP address and

domain name restrictions.6. In the IP Address and Domain Name Restriction dialog box that appears, click Denied

Access, and then click Add.

7. The Grant Access On dialog box

appears. Under Type, click Single

computer.

8. Type the IP address, in this example,

192.168.20.20 as shown in Figure 8.9,

and then click OK.

9. Click OK again to complete the configu-ration, and close Internet Information

Services Manager.

Opening Remote Administration

Although it is possible to open remote admin-

istration of Web servers and Web sites to all

computers, it is advisable for security

purposes to grant access to only a select

group of computers.

8/3/2019 0672326094_chapter_8

21/21

After the Remote Tool is installed, and the Web server is enabled for remote administration,

perform the following steps to remotely administer the Web server:

1. Start Microsoft Internet Explorer, and then type the host name of the Web server, followed

by the port number that was recorded earlier in the SSL Port box, and then click Go.

For example, if the Web server is on an intranet, and the SSL port number is 8098, type

the following URL: https://ServerName:8098 (where ServerName is the name of the

Web server).

2. At the prompt, enter a username and password for the Web server. The Remote

Administration Tool is then displayed in the browser window.

3. From this point, there are several links and options to choose from in administering the

Web server. Choose one that is appropriate for the task at hand and continue to remotely

manage the server.

Summary

Windows Server 2003 provides a wealth of options that enable administrators the flexibility

necessary to manage servers in a distributed IT environment through remote administration

tools and techniques. Although some tools are really just enhancements of technologies intro-

duced in earlier operating systems, there are many new features that make Windows Server 2003

a compelling alternative and worthwhile investment in terms of both manageability and secu-

rity. Administrators can now remotely attach to servers without a network connection,

keyboard, mouse, or video adapter to troubleshoot and bring the server back online without

ki i d ti l i it t th h i l l ti


182

FIGURE 8.9

Securing RemoteAdministration of IIS.

0672326094_chapter_8

Documents