Symptoms
Client connections to the Microsoft Forefront Unified Access Gateway (UAG) 2010 Service Pack 4 (SP4) trunk for published applications may fail, and the client receives the following error message:
Error HTTP 503The Service is unavailable.
Additionally, you may find intermittently logged Application log errors that are related to an application fault for Internet Information Services (IIS) worker process. These errors resemble the following:
Faulting application name: w3wp.exe, version: 7.5.7601.17514, time stamp: 0x01234567Faulting module name: KERNELBASE.dll, version: 6.1.7601.18409, time stamp: 0x76543210Exception code: 0xc0000005Fault offset: 0x000000000000940dFaulting process id: 0x1234Faulting application path: c:\windows\system32\inetsrv\w3wp.exeFaulting module path: C:\WINDOWS\system32\KERNELBASE.dll
Cause
This problem occurs because of incorrect connection handling in the UAG Whlfilter.dll file.
Resolution
This problem is fixed in Rollup 2 for Forefront Unified Access Gateway 2010 Service Pack 4.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
