[BlueOnyx:01494] Re: SSH Closes Connection

Michael Stauber mstauber at blueonyx.it
Wed Jun 24 18:55:00 PET 2009

Hi Richard,

> Bit more of a problem now. I cannot get access by SSH, SCP or even with a
> monitor and keyboard attached to it. The admin GUI and all of the sites
> continue to work but that probably won't last long and for some reason I
> will need access. Sorry for posting in the top forum and this is a
> BlueQuartz box but does anyone have the best course of action that I can
> take here please?

Well, if that box is a BlueQuartz, then this is not really the right list for 

But in general what I said in my previous message on that topic applies:

Apparently you shot your authentication layer when you applied the NuOnce 
procedure to switch your box from PAM to Shadow.

If you followed the procedure to the letter, then you created backup files of 
almost everything you replaced or modified. Best thing would be to copy those 
backups back and to revert the box to its previous state.

As you cannot login anymore (even with keyboard and monitor attached) you must 
boot off the CD to bypass the authentication.

So do this:

1.) Boot the server off the BlueQuartz CD. 

2.)  At the BlueQuartz splash screen type in "rescue" to enter rescue mode. Or 
"linux rescue" if that doesn't work.

3.) Set your language and keyboard and choose to configure the network.

4.) If asked if you want to access your disks, choose the leftmost from the 
three options. Which should already be selected, so just hit return.

5.) Once you reach the command prompt, type "chroot /mnt/sysimage/" to chroot 
the filesystem on the HDs.

At that point you can access your data directly as if you'd be logged in to 
the problematic server as /root.

As first thing check if the directory /SYSTEM-BACKUP is still present. You 
created it when you ran the NuOnce procedure.

If it is, you need to copy all files from that directory back to the places 
where they came from.

That should almost get you going again, but you also need to fix the two files 
you edited, meaning:


Those changes need to be reverted as well. Look at the initial procedure to 
see what needs to be changed to get those files back to their original state.


Copy the file /etc/pam.d/system-auth.backup back to /etc/pam.d/system-auth:

cp /etc/pam.d/system-auth.backup back /etc/pam.d/system-auth

If you managed to revert back all those changes you made, then you could try a 
reboot and see if it works. To do so simply type "/sbin/reboot" and be sure to 
eject the CD, too.

With best regards

Michael Stauber

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