The problem is likely related to the fact that you're using both dots *AND* slashes. As I recall, the principal example/admin@YOURREALM would automatically map itself to pts user example.admin, so my WAG is that ptserver is trying to map to 'bobb.crosbie/admin' and coming up with 'bobb.crossbie.admin' or somethning like that. Others can certainly speak with more definitive voices than I.