Backup Failure (V-79-57344-65072)

Hello.

I am running backup exec version 12.0............my backups used to work but now its failing with error message "V-79-57344-65072 - The connection to target system has been lost. Backup set canceled". I checked the web sites and followed the  requested procedures.......checked network, dcom..etc.

Please assist in resolving this issue.

Many Thanks and Regards

Selvum Moodley