Unexpected authentication challenge responses (401/407) received from a non-server source. Over the past %1 minutes, %2 challenge responses have been received and dropped. Cause: This could either be clients sending challenges, or a configuration issue in the topology. Resolution: Please ensure that servers in the topology are talking to each other over mutually-authenticated TLS (MTLS) connections.
Unable to use the default outgoing certificate. Error %1 (%2). Cause: The certificate may have been deleted or may be invalid, ...
Unable to validate xml Over the past %1 minutes Lync Server has received invalid xml %2 times. Xml data: %3 Exception: %4 ...
Unable to write registry value under a key. The LS A/V Edge Server service will stop. Key Path: %1 Value Name: %2 Value Type: ...
Unavailable authorization authority causing errors. There were %2 failures because the authority was unavailable in the last ...
Unexpected authentication challenge responses (401/407) received from a non-server source. Over the past %1 minutes, %2 challenge ...
Unexpected error occurred in the Bandwidth Policy Service (Core). Exception: %1 Cause: An unexpected error has occurred. ...
Unexpected error occurred in the LS Audio/Video Authentication service. Exception: %1 Cause: An unexpected error has occurred. ...
Unexpected error occurred in the LS Bandwidth Policy Service (Authentication). Exception: %1 Cause: An unexpected error has ...
Unexpected error occurred in the Mediation Server. Mediation Server stopped listening for incoming connections on gateway ...