Login Incorrect on Unix
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Mistake in security related configuration file  (or)  in passwd file

Fault Insertion

1. Edit /etc/pam.conf and comment out 1 line for the login service.
Before edit:
login auth required pam_unix_auth.so.1
After edit:
#login auth required pam_unix_auth.so.1
2. Log off.
3. Try to login.

Fix/Workaround :

Uncomment the line in /etc/pam.conf