The Persistent Chat server can not establish or maintain MTLS connection to the Lync Server. Reason string: %1 Error code: ...

Lync Server 2013

The Persistent Chat server can not establish or maintain MTLS connection to the Lync Server.

Reason string: %1

Error code: %2

Cause: This problem is usually caused by an invalid MTLS certificate configured on the Persistent Chat Server or Lync Server.
Resolution:
Review certificate related sections in Persistent Chat Planning and Deployment Guide. Ensure the MTLS certificates configured on the Persistent Chat Server and Lync Server are valid.

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