Bob Griffin (11/19/2012)
Specifically, the user that the sql database server is running as has to have permissions to read the backup file. If possible, browse to the bak file as the sql server user. Another option is to copy the bak file directly onto the machine that you are restoring to.
It's a different domain though, this would make a difference when authenticating wouldnt it?
copying the .bak from ServerA to somewhere local on ServerB as restoring will more than likely fix his problem but i think he is looking for a solution via the method he is trying.