SSH won't accept key

[TSch]

Good morning folks,

on sunday we had to restore one of our machines using an mksysb from 6th May.

Since then there have been no changes to the machine's ssh installation.

But after the restore we were unable to Login to the machine using ssh (Lucky for us the telnet is still open on that machine ...). I checked the authorized_keys file and everything's fine. It is same key as before we performed the restore.

Generally ssh is working. The subsystem is running an we can ssh from that machine to another machine ...

Any ideas ?

Regards
Thomas

 

[khalidaaa]

That's exactly what happened to me! when i restored from a mksysb i got the following message when i tried to ssh

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
69:2d:1c:73:08:52:2f:d8:05:ca:7e:b7:42:f0:0c:39.
Please contact your system administrator.
Add correct host key in /.ssh/known_hosts2 to get rid of this message.
Offending key in /etc/ssh/ssh_known_hosts2:8
RSA host key for s1empac has changed and you have requested strict checking.

I think the machine id has changed! so i had to go to the machine it self and do the ssh to the other machine and now it is working!

I just need to get rid of this message by updating the know_hosts2 in the etc!

Regards,
Khalid

 

[TSch]

I'll have a look into this.

Thanks a lot !

 

[khalidaaa]

Thomas,

Just to update you with the solution to the warning i got above, i just had to restore /etc/ssh directory from a previous mksysb backup on that machine and then i had to stopsrc -s sshd and startsrc -s sshd and now every thing is back to normal!

I thought of sharing it with you and I hope this helps you as well.

Regards,
Khalid

 

[ogniemi]

I would recommend to re-generate host keys to have uniq on each none-cluster system (in cluster I keep the same)

 

[TSch]

Hi Khalid,

everything's fine now.

Thanks a lot for the help !

Regards
Thomas