Microsoft KB Archive/810559

= FIX: Slow Responses and Failures When You Use Server Publishing UDP Protocols =

Article ID: 810559

Article Last Modified on 4/4/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2000 Service Pack 1

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IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
When you use Server Publishing UDP Protocols (for example, DNS Query), you may notice a variety of problems:
 * A lot of performance problems.
 * You cannot connect to the published DNS server externally.
 * The server may also stop responding after some days and the only resolution is to restart the computer.

Typically, these problems occur when you use Server Publishing DNS Query protocols where requests to the published DNS server from external sources receive a response only after a long delay, or not at all (the request does not succeed).

Note You do not experience these symptoms when you use Server Publishing TCP protocols through ISA Server (for example, DNS Zone Transfer).

These problems occur only if the Site and Content Rules match one of the following configurations:
 * There is at least one Deny Site and Content Rule configured that includes FQDN in Destination Sets.
 * There is no Allow All rule configured, and at least one of the Allow Site and Content Rules includes FQDN in Destination Sets.



WORKAROUND
Make sure that no FQDN are included in Site and Content Rules on the computer running ISA Server where you have configured the UDP Server Publishing Rule.



RESOLUTION
To resolve this problem, obtain the Update Rollup for ISA Server Services. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

810493 INFO: Update Rollup for ISA Server Services

Hotfix Information
WARNING: If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk. Because the hotfix implements the use of Negative DNS Cache, you must set the appropriate TTL value in the registry. To do this, follow these steps:  Start Registry Editor. Locate and then click the following registry key:

 Create a new DWORD value named NegativeDnsCacheTTL. Microsoft recommends that you give this data a value of 300 (5 minutes).

Important If this value is missing, or set to 0, ISA Server will not use negative caching and the fix will not work correctly.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

Keywords: kbhotfixserver kbqfe kbqfe kbisaserv2000presp2fix kbfix kbbug KB810559

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