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FIX: "HTTP 503" errors on a server that is running Forefront Unified Access Gateway 2010 Service Pack 4

Symptoms
You may see HTTP 503 errors returned from a server that is running Microsoft Forefront Unified Access Gateway 2010 Service Pack 4. This condition remains until the worker process is recycled or until Internet Information Services (IIS) is restarted. Additionally, HTTP 503 errors are logged in the HTTP.sys log file that has a status of "Queue Full."
Cause
This problem is caused by a deadlock that stops requests from being processed. Eventually, requests back up in the request queue until it is full. At this point, the error occurs for all successive requests.
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.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
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Article ID: 3068283 - Last Review: 06/19/2015 17:06:00 - Revision: 1.0

Microsoft Forefront Unified Access Gateway 2010 Service Pack 4

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