test-outlook connectivity failures

I have two failures that I dont know why and how to fix it.

RFRI::GetReferral.                  Failure   -1.00
NSPI::GetProfileDetails.            Failure   -1.00

VERBOSE: [11:22:49.987 GMT] Test-OutlookConnectivity : Microsoft.Exchange.Rpc.ServerUnavailableException: Error 0x6ba
(The RPC server is unavailable) from cli_RfrGetNewDSA

VERBOSE: [11:22:57.518 GMT] Test-OutlookConnectivity : Microsoft.Exchange.Rpc.ServerUnavailableException: Error 0x6ba
(The RPC server is unavailable) from cli_NspiBind