Logging in to a system is a two-step process.
Type your login ID at the Login: prompt.
Type your password at the Password: prompt.
(To maintain password secrecy, your password is not displayed on your screen when you type it.)
If your login is successful you will see your system's message of the day (if any) and then your command-line prompt, windowing system, or normal application.
The Login incorrect message indicates that:
You have entered the wrong login ID or the wrong password. This is the most common cause of the Login incorrect message. Check your spelling and repeat the process. Note that most systems limit to five the number of unsuccessful login tries you can make:
If you exceed a number of tries limit, you will get a Too many failures - try later message and not be allowed to try again until a designated time span has passed.
If you fail to successfully log in within a specified amount of time you will receive a Too many tries; try again later message, and not be allowed to try again until a designated time span has passed.
Another possible cause of the Login incorrect message is that an administrator has locked your password and you cannot use it until it is unlocked. If you are sure that you are entering your login ID and password correctly, and you still get a Login incorrect message, contact your system administrator.
Another possible cause of the Login incorrect message is that an administrator has expired your password privileges and you cannot use your password until your privileges are restored. If you are sure that you are entering your login ID and password correctly, and you still get a Login incorrect message, contact your system administrator.
If you receive a Your password will expire in N days message (where N is a number of days), or a Your password will expire within 24 hours message, it means that your password will reach its age limit and expire in that number of days (or hours).
In essence, this message is telling you to change your password now. (See Changing Your NIS+ Password.)
After entering your login ID and password, you may get a Permission denied message and be returned to the login: prompt. This means that your login attempt has failed because an administrator has either locked your password, or terminated your account, or your password privileges have expired. In these situations you cannot log in until an administrator unlocks your password or reactivates your account or privileges. Consult your system administrator.