Client Version 4.1 on Windows 2003 Server

Am using client version 4.1 on a WIN 2003 Server. It works the first time, it does a Full Image back up, after that its fail over and over. Error Message: Client disconnected and image is not persistent (Timeout: false). Any has run into this error? I download version 4.1.9 and 4.1.11 and the same error happens again.