I recently installed 2 exchange servers and added to existing DAG. The DAG has a total of 3 servers. Now a few users can't connect to exchange. While add the profile, it failed at "Logging on to the mail server". The error Outlook can't log on. Verify you are connect to network and are using proper server and mailbox name. The connection to Microsoft Exchange is unavailable. Outlook must be online or connected to complete this action.
What could be the problem? Thanks.