We're just starting to deploy CUPC 1.2 internally to our IT department. So far, it's working well for all but one user. He can connect just fine, can see the status of everyone else, and can send instant messages with no issue. However, while he's connected, he shows as offline to everyone else, and we are unable to reply back to his messages It says "user did not receive your message because the message could not be sent."
We've tried everything we can think of, redoing all his settings, reinstalling the client software, nothing. Does anyone have any idea what could possibly be causing this?