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> Yet when I enter: > cu -l /dev/ttyS0 > > I receive the message: > cu: open (/dev/ttyS0): Permission denied > cu: /dev/ttyS0: Line in use Looks like a Red Hat problem to me. Assuming that you bought it from Red Hat, I suggest you make them work for their money. Otherwise it looks as though permissions are wrong on the devices or the lock file directory.