If you enter either your username or your password incorrectly, the system displays an error message after you enter both your username and your password. This message indicates that you have entered either the username or the password incorrectly or that they are not valid. It does not differentiate between an unacceptable username and an unacceptable password—a strategy meant to discourage unauthorized people from guessing names and passwords to gain access to the system.
Following are some common reasons why logins fail:
• The username and password are case sensitive. Make sure the CAPS LOCK key is off and enter your username and password exactly as specified or as you set them up.
• You are not logging in on the right machine. The login/password combination may not be valid if you are trying to log in on the wrong machine. On a larger, networked system, you may have to specify the machine you want to connect to before you can log in.
• Your username is not valid. The login/password combination may not be valid if you have not been set up as a user.
• A filesystem is full. When a filesystem critical to the login process is full, it may appear as though you have logged in successfully, but after a moment the Login screen reappears. You must boot the system in rescue mode and delete some files.
• The account may be disabled. The root account is disabled from a GUI login by default. An administrator may disable other accounts. Often the root account is not allowed to log in over a network. You must use su or sudo if you need to work with root privileges from a remote system.
Source of Information : Prentice Hall A.Practical Guide to Fedora and Red Hat Enterprise Linux 5th Edition
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