Symptoms
Consider the following scenario:
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You install Microsoft Forefront Unified Access Gateway (UAG) Service Pack 1 (SP1) Update 1 on a server.
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You configure Forefront UAG 2010 to use a form-based single sign on (SSO) template for a web application.
In this scenario, when users who are already logged on to the UAG portal try to access the published web application, UAG does not perform SSO, the users receive an authentication error, and the logon fails. However, the users can manually enter their credentials and then access the web application.
Cause
This issue occurs because the SSO form does not include valid credentials when the form is submitted to the published web application.
Resolution
To resolve this issue, install the rollup package that is described in the following Microsoft Knowledge Base article:
2647899 Rollup 1 for Forefront Unified Access Gateway (UAG) 2010 Service Pack 1 Update 1
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates
