Article ID: 2655027 - Last Review: January 12, 2012 - Revision: 3.0

FIX: "HTTP 503" errors may occur when you publish AD FS 2.0 servers by using Forefront Unified Access Gateway 2010

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SYMPTOMS

By default, when you publish Active Directory Federation Services (AD FS) 2.0 servers by using Microsoft Forefront Unified Access Gateway (UAG) 2010, the built-in AD FS template is used. However, in a scenario in which this configuration is loaded with approximately 250 concurrent users, the server that is running Forefront UAG may stop responding or crash with "HTTP 503" errors. The "HTTP 503" errors are returned from Internet Information Services (IIS) because the IIS request queues are full.
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RESOLUTION

To resolve this issue, install the rollup package that is described in the following Microsoft Knowledge Base article:
2647899  (http://support.microsoft.com/kb/2647899/ ) Rollup 1 for Forefront Unified Access Gateway (UAG) 2010 Service Pack 1 Update 1

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STATUS

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

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684  (http://support.microsoft.com/kb/824684/ ) Description of the standard terminology that is used to describe Microsoft software updates

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APPLIES TO
  • Microsoft Forefront Unified Access Gateway 2010 Service Pack 1
  • Microsoft Forefront Unified Access Gateway 2010
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Keywords: 
kbqfe kbfix kbexpertiseinter kbbug kbsurveynew KB2655027
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