I've seen applications (older, usually IT created, but sometimes "enterprise software") that use the passwd file for their own authentication. Remove the abilit

I've seen applications (older, usually IT created, but sometimes "enterprise software") that use the passwd file for their own authentication. Remove the ability for a user to authenticate against the system and they no longer have access to the application. It wouldn't surprise me if this server was involved with the school's student information system and did just that.