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05-21-2008
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forgot root passwd
hi
i have a RHEL 4 and have forgot root passwd tried to boot in by singel user and then changing the passwd but it's not letting me do that ......throwing some weird error as .......manipulation i also tried to make a new user from CLI but even though it's not letting me in from that user as well ....... i even tried 'rm shadow' that dosent help as welll.....!! please advice.... techbravo |
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05-21-2008
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Hi,
If you still have the install CD then boot from it into rescue/repair mode, mount the disk which hosts /etc/passwd & /etc/shadow and erase the root password ... What weird error did you get when booting in single user ? is it password protected ?  |
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05-21-2008
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What hardware & op system?
Not sure what rhel4 means, though.
I seem to recall that one way around this is to boot the server from the op console port in single-user mode, and then to reset the password. When starting in this mode, you should not get a password prompt. |
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05-21-2008
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05-21-2008
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IS the filesystem mounted RW? if not remount it with
mount -o remounnt,rw / Check the permission of /etc/shadow and /etc/passwd Do history and see what commands were run related passwd tail /var/log/messages and see related messages. Post here if u dont understand. Good luck! |
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05-22-2008
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the error is as follows
passwd:authencation token manipulation error i tried creating another user but it's not alowing me switch user can i know how to swith user so that can be tried..... i think that should work .......!!  |
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05-22-2008
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Without being crazy enough to test my hypothesis, this is only speculation, but if you have removed the shadow file, I wouldn't be too surprised if that's the reason you get this error.
Do you have a backup? Can you recreate it somehow? The customary solution is to boot into single user (perhaps from a CD or USB stick) and edit the /etc/passwd or /etc/shadow file to have an empty password field for root. Then boot the regular system, log in as root, and set a new password. |
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