Thanks for the response, seniorpete. I should add that we are using one BE box to back up servers on 2 domains. I have checked the user permissions for the BE user, and that's not the problem. I can map drives no problem, the only way I can't connect is through BE. What's worse, we have several boxes set up on both domains that are exactly the same. Some fail, and some don't. Anyway, I thought the problem was domain related, but I have failures and successes on both domains, all the failures are "Unable to attach: Access Denied". Has anyone had problems backing up across domains? I been through the tech notes, but so far their suggestions haven't yielded any results.