Unavailable authorization authority causing errors. There were %2 failures because the authority was unavailable in the last ...

Unavailable authorization authority causing errors.

There were %2 failures because the authority was unavailable in the last %1 seconds. The last one was this SIP message:

%3

Cause: This could be because of problems with the local security provider or because of network connectivity issues to domain controllers.
Resolution:
Check DC/GC connectivity. If problem persists, restart the server.