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Authentication for federated users is slow or fails for Office 365 rich clients that use the AD FS 2.0 WS-Metadata Exchange (MEX) endpoint
Article ID: 2461794 - View products that this article applies to.
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Authentication of single sign-on (SSO)-enabled users is slow and may eventually fail when users use Microsoft Office 365 rich client applications that connect to the Active Directory Federation Services (AD FS) 2.0 WS-Metadata Exchange (MEX) endpoint. This issue affects the following rich client applications when these applications are used to connect to Office 365 resources:
The issue may occur as the result of a memory leak that's associated with the /adfs/services/trust/mex Internet Information Services (IIS) endpoint. This endpoint is associated with AD FS 2.0. Rich client applications use this endpoint to determine whether the client computer is connecting to an AD FS 2.0 proxy service from the Internet or to the AD FS 2.0 Federation service from inside the on-premises corporate network.
When this problem occurs, and you direct a web browser to the MEX endpoint, the webpage returns the following error message:
500 Internal Server Error
To resolve this issue, install the update that's described in the following Microsoft Knowledge Base article:
(http://support.microsoft.com/kb/2607496/ )Description of Update Rollup 1 for Active Directory Federation Services (AD FS) 2.0
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Article ID: 2461794 - Last Review: May 15, 2013 - Revision: 12.0