FIX: An access violation occurs in the digest!CList::GetNext method when you run two or more WinHTTP 5.1 applications at the same time that use Digest Authentication in Windows Server 2003

An access violation (AV) occurs in the digest!CList::GetNext method when you run two or more Microsoft Windows HTTP Services (WinHTTP) 5.1 applications at the same time that use Digest Authentication. This problem occurs in Microsoft Windows Server 2003.

This problem occurs when multiple processes for the WinHTTP 5.1 applications try to access a data structure at the same time in the Digest Libraries. When this problem occurs, the WinHTTP 5.1 applications go out of synchronization. You experience an access violation.

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 Server 2003 service pack that contains this hotfix.

To resolve this problem immediately, 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: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.

Prerequisites

No prerequisites are required.

Restart requirement

You have to restart your computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

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
   ----------------------------------------------------
   02-Dec-2004  21:03  6.0.3790.239  59,904  Digest.dll       

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

Stack information

The top of the stack looks similar to the following:

# ChildEBP RetAddr 
00 05adbce8 73774a91 digest!CList::GetNext
01 05adbd10 73774be6 digest!CCredCache::FlushCreds
02 05adbd38 73772b53 digest!CCredCache::LogOffFromCache
03 05adbd40 76f518e1 digest!FreeCredentialsHandle
04 05adbd58 70c8b84e secur32!FreeCredentialsHandle
05 05adbd64 70c8bea1 winhttp!DIGEST_CTX::~DIGEST_CTX
06 05adbd6c 70c8b717 winhttp!DIGEST_CTX::`scalar deleting destructor'
07 05adbd84 70c8454c winhttp!AuthOnResponse
08 05adbda4 70c8498e winhttp!HTTP_REQUEST_HANDLE_OBJECT::HttpSendRequest_Start
09 05adbdac 70c77fb4 winhttp!CFsm_HttpSendRequest::RunSM
0a 05adbdc4 70c7814f winhttp!CFsm::Run
0b 05adbe10 70c6faa4 winhttp!StartFsmChain
0c 05adbe54 70c6ff00 winhttp!HttpWrapSendRequest

For additional information about Windows HTTP Services (WinHTTP), visit the following Microsoft Developer Network (MSDN) Web site: For additional information, click the following article number to view the article in the Microsoft Knowledge Base: