was unable to resolve the DNS hostname of the login server %2. Resolution: If you are using manual configuration for Communicator, ...

%1 was unable to resolve the DNS hostname of the login server %2.

Resolution:
If you are using manual configuration for Communicator, please check that the server name is typed correctly and in full.  If you are using automatic configuration, the network administrator will need to double-check the DNS A record configuration for %2 because it could not be resolved.