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Re: su doesn't work "Authentication failure"

From: Damon L. Chesser <damon(at)damtek.com>
Date: Thu Jan 31 2008 - 11:20:43 EST


paul wrote:
> Hello,
>
> on my debian etch machine 'su' doesn't work if a password is needed.
> It is possible to do 'su someuser' from root but it's not possible to
> get back to root then using just 'su' or change from a normal user to
> another user account.
>
>
> myserver:/tmp$ su
> Password:
> su: Authentication failure
> Sorry.
>
> auth.log says:
> Jan 31 15:44:18 myserver su[27729]: (pam_unix) authentication failure;
> logname= uid=1000 euid=1000 tty=pts/4 ruser=myuser rhost= user=root
> Jan 31 15:44:20 myserver su[27729]: pam_authenticate: Authentication
> failure
> Jan 31 15:44:20 myserver su[27729]: FAILED su for root by myuser
> Jan 31 15:44:20 myserver su[27729]: - pts/4 myuser:root
>
> I suspect sth. in with the pam module got broken.
>
> Any suggestions how to go on?
>
> thx, paul
>
>
>

Paul,

I had the same issue. I fixed it by doing two things:

  1. I used sudo to su to root "sudo su"
  2. As I had a BadCRC reported on a HD, I had to re-configure my hardware setup and re-install.

The first is a bandaide. The 2nd is a shotgun to kill a bug. Both worked. The source was never found.

HTH

-- 
Damon L. Chesser
damon@damtek.com



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Received on Thu Jan 31 11:20:06 2008

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