Known issues that occur when you install update 2509553 for Windows Server 2003

Issue 1

Consider the following scenario:

• You have Microsoft Internet Security and Acceleration (ISA) Server 2006 installed on a remote access server (RAS) that is running Windows Server 2003.
• You configure VPN remote client access by using ISA Server 2006.
• You install the following update on the server.
  2509553 MS11-030: Vulnerability in DNS Resolution could allow remote code execution: April 12, 2011
• A user enters their username by using the user principal name (UPN) format to establish a VPN connection to the RAS. For example, the user enters username@example.microsoft.com as their username.

In this situation, the RAS encounters a deadlock situation, and the user cannot establish the VPN connection. To recover from this issue, you have to restart the server.

Issue 2

After you install the update that is described in Microsoft Knowledge Base (KB) article 2509553 on a Windows Server 2003-based server, users experience slow network performance. This issue is caused by slow DNS name resolution.

To resolve this issue, install the following hotfix on the computer that is running Windows Server 2003.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft website: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Server 2003 Service Pack 2 (SP2).

For more information about how to obtain a Windows Server 2003 service pack or a Windows XP Professional x64 Edition service pack, click the following article number to view the article in the Microsoft Knowledge Base:

Registry information

To apply the hotfix, you do not have to make any change to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Server 2003 file information notes

• In addition to the files that are listed in these tables, this hotfix also installs an associated security catalog file (KBnumber.cat) that is signed with a Microsoft digital signature.

For all supported x86-based versions of Windows Server 2003

For all supported x64-based versions of Windows Server 2003

For all supported IA-64-based versions of Windows Server 2003

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base: