Symptoms

Assume that you deploy Microsoft Lync Server 2010 Mobility Service in a Lync Server 2010 environment. When Mobility Service encounters an unhandled exception, a user cannot sign in by using a mobile device. Additionally, the following event is logged in the Application log on the server:

Cause

This issue occurs because Mobility Service does not correctly process the unhandled exception. This causes a deadlock in the service.

Resolution

To resolve this issue, install either of the following updates:

2665325 Description of the update for Lync Server 2010, Mobility Service: February 2012

2675053 Description of the cumulative update for Lync Server 2010, Mobility Service: February 2012

Workaround

To work around this issue, recycle the W3wp.exe process when the issue occurs, and then users can sign in.

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