Symptoms
Consider the following scenario:
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You have many client devices joined to a Workplace by using Device Registration Service (DRS) on a Windows Server 2012 R2-based server.
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You try to access a resource by using device authentication through Active Directory Federation Services (AD FS) on one of the client devices.
In this scenario, either the device authentication takes several seconds to complete, or it fails and prevents access to the resource.
Cause
This issue occurs because a suboptimal Lightweight Directory Access Protocol (LDAP) search filter is used to look up the registered device object during device authentication.
Resolution
To resolve this issue, install update rollup 2962409. For more information about how to obtain this update rollup package, click the following article number to view the article in the Microsoft Knowledge Base:
2962409 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: June 2014
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
More Information
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
