I am using time machine to backup to a network drive. I am having two machine and i am able to backup from one machine to the network drive. But on the other machine when i mount the drive, i select it in time machine references. It ask me for user and password. When backup start i get an error saying "the network backup volume could not be mounted because there was a problem with the network username or password." I am finding it odd it is working fine with one machine and not working at all with the other machine.