Microsoft KB Archive/257379

= Wspsrv.exe Exception: Access Violation (0xC0000005) =

Article ID: 257379

Article Last Modified on 11/1/2006

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APPLIES TO


 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Proxy Server 2.0 Standard Edition

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This article was previously published under Q257379



SYMPTOMS
The Proxy Server 2.0 Winsock Proxy service may stop and may generate a Drwtsn32.log file. The error message is:

WSPSRV.EXE Exception: access violation (0xC0000005)

The module causing the access violation is Rnr20.dll.



CAUSE
This problem can occur if you use Proxy Server 2.0 to server proxy for Exchange Server. Reverse Domain Name Service (DNS) lookups generated by domain filters on either the proxy server or the Exchange SMTP service may trigger the access violation.

The access violation is actually being caused by single-threaded programs generating an excessive number of GetXbyYData calls.



RESOLUTION
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone 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 usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question. The English-language version of this fix should have the following file attributes or later:   Date        Time      Size      File name ---  05/01/00    06:48p    77,584    Mswsock.dll 05/01/00   06:48p    45,840    Rnr20.dll 05/01/00   06:48p    20,752    Wsock32.dll

To prevent this problem from occurring, disable anything that may create a large number of reverse DNS lookups.

In Proxy Server 2.0, disable domain filters.

In Exchange Server, disable SMTP reverse DNS lookups. For additional information about how to do this, click the article number below to view the article in the Microsoft Knowledge Base:

190026 XFOR: SMTP Protocol Log Only Shows Connection Established Else



STATUS
Microsoft has confirmed that this is a problem in Windows NT 4.0.



MORE INFORMATION
This problem does not occur in Microsoft Windows 2000.

Keywords: kbhotfixserver kbqfe kbbug kberrmsg kbfix kbqfe KB257379

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