I had a very irritating problem on one of my OEL 5 virtual machines, actually on my main Oracle 11g database test server, which is the last stop before production.
Googling did not solve this problem for me, since this error can apparently be caused by several things, so it was unresolved for many weeks, and I considered just creating another virtual machine instead, and reinstalling Oracle.
But this morning, I easily solved the problem, just by reading a man page a little more closely, so I thought I’d share my experience :)
For some unknown reason, I could suddenly not change the password of my oracle user, neither as root or as the user itself, because using the command passwd immediately gave me the message “passwd: Authentication token manipulation error”. I could log in as the user, though, for example by doing su – oracle, or by ssh-ing in with public keys set.
Google thought this had to do with a lot of file access or pam settings issues that I knew were not relevant to my problem, partly because I always received this error before I got to write any new password for the user at all.
Solution (for me):
passwd (when run from the root account) also has the option -d, to delete (set to null), a user’s passwd. It occurred to me that this might work, since it might not involve any checks against the existing, somehow corrupt, passwd. And it did. So, for me, the 10 second solution was – as root:
passwd -d oracle
Hope it might be helpful to others!