New users, or users who recently changed their password are unable to log in at all, or able to log in on one or more machines but not on others. The user may see error messages with operative clauses such as:
First Possible Cause:
Password was changed on NIS machine.
If a user or system administrator uses the passwd command to change a password on a Solaris operating environment machine running NIS in a domain served by NIS+ namespace servers, the user's password is changed only in that machine's /etc/passwd file. If the user then goes to some other machine on the network, the user's new password will not be recognized by that machine. The user will have to use the old password stored in the NIS+ passwd table.
Check to see if the user's old password is still valid on another NIS+ machine.
Use passwd on a machine running NIS+ to change the user's password.
Second Possible Cause:
Password changes take time to propagate through the domain.
Namespace changes take a measurable amount of time to propagate through a domain and an entire system. This time might be as short as a few seconds or as long as many minutes, depending on the size of your domain and the number of replica servers.
You can simply wait the normal amount of time for a change to propagate through your domain(s). Or you can use the nisping org_dir command to resynchronize your system.