Microsoft KB Archive/327550

= The ISA Server Web Proxy Service Causes an Access Violation During DNS Lookups =

Article ID: 327550

Article Last Modified on 10/27/2006

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 3
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Internet Security and Acceleration Server 2000 Service Pack 1

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This article was previously published under Q327550



SYMPTOMS
The Web Proxy service (W3proxy.exe) may intermittently cause access violations with error 0xc0000005. If you take a network trace, you see that a DNS response is returned to Internet Security and Acceleration (ISA) Server immediately before the access violation occurs.



CAUSE
The DNS server that ISA Server is using returns an &quot;A&quot; record in response to a PTR record query. This is incorrect behavior by the DNS server. However, the DNS resolver permits the information to pass to ISA Server.



Service Pack Information
To resolve this problem, obtain the latest service pack for Microsoft Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

260910 How to Obtain the Latest Windows 2000 Service Pack

Hotfix Information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that is described in this article. Only apply it to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next Windows 2000 service pack that contains this hotfix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

NOTE: In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The typical support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The English version of this fix has the file attributes (or later) 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 --  03-Sep-2002  18:03  5.0.2195.6042  64,784  Mswsock.dll 03-Sep-2002 18:03  5.0.2195.6042  36,112  Rnr20.dll



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Microsoft Windows 2000 Service Pack 4.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

Keywords: kbbug kbfix kbwin2000presp4fix kbqfe kbdirservices kbwin2ksp4fix kbhotfixserver KB327550

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