Hi,
I guessed that it could be a permissions issue, but the error message pointed to another way.
I'm not really sure what the permissions were, but since the instance (remote) was running as system, i guess that at least this user is contemplated in the permissions.
I'm guessing that wether you select a custom folder from the restore wizard, or when you're attaching directly, you're accessing the remote server with the sa credentials (sa?? probably the sa credentials grants you to access the remote folder tree with the user that's running the sql instance) that are the same in either case.
I'd have to test it, but in this situation as it was on a costumer, that's one of those things that probably will pass by 😉
Thanks for the replies though.
Have a good weekend
David