If you enter the correct account and password in CentOS, you cannot log on to it. The centos account and password

If you enter the correct account and password in CentOS, you cannot log on to it. The centos account and password
Exception description:CeontOS_x86_64 server, SSH can log on normally, IDC operators log on through the HP-KVM, after entering the correct account password, rewrite back to the login interface, and no prompt, if you enter an incorrect account password, a message is displayed, indicating that the password is incorrect!
This exception only occurs on some AP servers, but not on oracle DBserver.
Suspect object:: CentOS Security Authentication PAM. We found this is true after comparison!
In the/etc/pam. d/login file of APserver, add
Session required/lib64/security/pam_limits.so
Then the exception disappears!
The specific cause is being analyzed --