Password correctly unable to log into Linux system

The user name password is correct but cannot log into the Linux server this, the most likely to have the following kinds:

1, disk space is full, unable to log on to the Linux server. Restart the server try or delete some unnecessary files.

2, is indeed the password forgotten, into the single-user mode to change the password on the line.

3. Modify the system parameters as required by the documentation when installing Oracle 10G

Vi/etc/pam.d/login

Add the following statement session Required/lib/security/pam_limits.so

If the local user cannot log on to the system, the following resolves:

Put the last line inside the/etc/pam.d/login: "Sessionrequired/lib/security/pam_limits.so"

Change to: sessionrequired/lib64/security/pam_limits.so save reboot just fine

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Password correctly unable to log into Linux system