Lync 2013 Meetings Fail in Migration Situation

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After migrating to Lync 2013 from Lync 2010 or OCS, users may be unable to join Lync Online Meetings. In the Lync client when you select “Meet Now” you may get the following error – “A server error occurred. Please contact your support team”

Additionally you may see the following event logged on the Front End server:
Event 51048 LS MCU Factory:
McuFactory could not find the pool associated with one of the conference directories.
Failed to read pool FQDN associated with conference directory 20.
Cause: The pool associated with the conference directory does not exist anymore.
Resolution: Conference directories without a valid pool associated can be deleted using management tools.

If you run a trace on the Front End server you may see the following:
Start-Line: SIP/2.0 500 failedLookupForConferenceDirectoryOwner
ms-diagnostics: 3193;reason=”Could not find a front end server that owns the given pstn meetind id.

This issue is commonly caused when you have orphaned conference directories. You can check for orphan directories using the following PowerShell command:

Review the output and check to see if there is a ServiceID matching a pool which no longer exists. BackCompatSite entries refer to OCS 2007 R2 servers added during a merge operation. If a Service ID exists for a pool that has already been deleted, the conference directory will need to be forcefully removed using the following PowerShell command:

Be careful here! Removing an active conference directory will force users to reschedule meetings!!

After you remove the conference directory you will need to restart the Front End Service for immediate results.

 

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