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Failed to register with back-end database. Microsoft Lync Server 2010, File Transfer Agent will continuously attempt to reconnect to the back-end.

Issue: Lync 2010 / 2013 client shows limited connectivity.
Error message: Lync Limited connectivity.
Problem Statement:
Recently one my customer site, all users where getting Lync limited connectivity error on Lync 2010/2013 client. Lync user status changed to presence unknown.
Buddy list shows as presence unknown and gray color.
When I checked on FE server found below error events.
Event ID: Event ID’s: 1020: Failed to register with back-end database. Microsoft Lync Server 2010, File Transfer Agent will continuously attempt to reconnect to the back-end.  While this condition persists, no replication will be done.
The Connection string: Data Source         =;
                Database            = xds;
                Max Pool Size       = 5;
                Connection Timeout  = 60;
                Connection Reset    = false;
                Enlist              = false;
                Integrated Security = true;
                Pooling             = true;
Exception: [-2] System.Data.SqlClient.SqlException: Timeout expired.  The timeout period elapsed prior to completion of the operation or the server is not responding.

Event ID: 32068: Failed to update Mcu health in the backend. This will be retried but if this continues to occur conferencing functionality will be affected.
Event log shows that backed connectivity was failure.  
Resolution / Workaround:
I have checked SQL server and found that server is unavailable due to that users presence information was not showing and users were getting limited connectivity error.
Actually Cluster network VLAN was down. Due to that SQL Cluster IP was not able to communicate to the cluster and it leads to SQL DB down.
Laster we have corrected cluster vLAN issue and now back-end is functioning correctly.
Later user’s presence status got corrected and everything is working as expected.  

Thank you


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