http://www.fmi.uni-passau.de/archive/doc/unix/unixhelp/Unixhelp/basics_basic1.2.html (Einblicke ins Internet, 10/1995)login incorrect login:
1. You made a typing error while entering your username or password.
2. The <Caps Lock> key is on and everything is being sent to the system in uppercase letters. UNIX is case sensitive. If your username is "helper", do not enter HELPER or Helper.