cp /etc/passwd /etc/passwd.local cp /etc/group /etc/group.localand remove entries from the local files corresponding to Athena users and groups which should not normally exist on your system. A lot of software breaks if /etc/passwd isn't world-readable, so you should run
chmod a+r /etc/passwd* /etc/group*afterward to be safe.
hesinfo username passwd >> /etc/passwd.local(Be sure to type both greater-than signs.)