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Assume that you create a new access rule or that you modify an existing access rule in Microsoft Internet Security and Acceleration (ISA) Server 2004. When you apply these changes to your firewall policy, users who are connected to the Internet experience approximately a 10-second delay when they try to log on to an external Web site.
When you create a new access rule or when you modify an existing one, you do not expect this action to affect user Internet connections.
This problem occurs if the following conditions are true:
A Web routing rule is configured in ISA Server 2004. This rule specifies an upstream proxy server by using that server's IP address.
You click Apply to apply a policy change in the ISA Server Management program. Or, the ISA Server Web Proxy Service is restarted.
In this situation, the ISA Server Web Proxy Service performs the following procedure:
The ISA Server Web Proxy Service marks the Web routing rules for re-evaluation.
When the first Web request arrives, the ISA Server Web Proxy Service re-evaluates the Web routing rules.
For each Web routing rule that forwards traffic to an upstream proxy server, the ISA Server Web Proxy Service retrieves the domain name of the upstream proxy server.
To retrieve the domain name of the upstream proxy server, the ISA Server Web Proxy Service calls a function that performs a reverse Domain Name Service (DNS) lookup on the IP address of the upstream proxy server. Therefore, users who are connected to the Internet may experience a delay when they request new Web sites.
Service pack information
To resolve this problem, obtain the latest service pack for Internet Security and Acceleration Server 2004. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
891024 How to obtain the latest ISA Server 2004 service pack
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. 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 Web site:
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.
No prerequisites are required to install this hotfix.
You do not have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace any other hotfixes.
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name ----------------------------------------------------------------- 01-May-2005 23:40 4.0.2163.261 647,952 W3filter.dll
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Internet Security and Acceleration Server 2004 Service Pack 2.
For more information about how to install ISA Server 2004 hotfixes and updates, click the following article number to view the article in the Microsoft Knowledge Base:
885957 How to install ISA Server hotfixes and updates
For more information about the terms that are used in this article, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates