The 64-bit centos password is correct, but you cannot log on to the system.

 

Very strange ~ The server is in centos 64bit init 3 mode. You can log on remotely through SSH, but the monitor cannot directly connect to the keyboard. Entering the correct account and password on the logon page will return to the logon page again without any prompt, If you enter an incorrect account or password, an error occurs. At the moment you press enter, you can see that there is a line below the password with the prompt "module is unknown ". Why. Solution: Press a under grub to enter append mode, and enter single press enter at the end to enter but user mode. Restart the computer to enter the single user mode VI/etc/PAM. d/login Set the following lines: Session required/lib/security/pam_limits.so Replace: Session required/lib64/security/pam_limits.so Restart and troubleshoot.