[c-nsp] SSH no longer functions after hostname change

[jon at defenderhosting.com]

Hi Ryan/Paul-

Not without scheduling a maintenance window which I was hoping to avoid.  I am sure a reload would fix the problem as i'd also use it as an opportunity to upgrade the code since I am a half dozen revs behind and have switches running newer versions without any stability issues.


Jon Wolberg
Systems Engineer
Virtacore Systems Inc.
"We Virtualize IT!" 


----- Original Message -----
From: "Paul Stewart" <paul at paulstewart.org>
To: "Jon Wolberg" <jon at defenderhosting.com>
Cc: cisco-nsp at puck.nether.net
Sent: Monday, August 10, 2009 12:35:14 PM GMT -05:00 US/Canada Eastern
Subject: RE: [c-nsp] SSH no longer functions after hostname change

That is very strange.... are you able to kick the switch (power cycle) to see if it resolves or not?  I know you shouldn't have to but I'm out of answers too ;)

-----Original Message-----
From: Jon Wolberg [mailto:jon at defenderhosting.com] 
Sent: Monday, August 10, 2009 12:20 PM
To: Paul Stewart
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] SSH no longer functions after hostname change

Hi Paul-

The funny thing is this is the only switch causing problems.  We changed the hostnames on over a dozen others without any issues.

I tried re-generating the keys to no avail.


Jon Wolberg
Systems Engineer
Virtacore Systems Inc.
"We Virtualize IT!" 


----- Original Message -----
From: "Paul Stewart" <paul at paulstewart.org>
To: "Jon Wolberg" <jon at defenderhosting.com>, cisco-nsp at puck.nether.net
Sent: Monday, August 10, 2009 12:17:14 PM GMT -05:00 US/Canada Eastern
Subject: RE: [c-nsp] SSH no longer functions after hostname change

Normally all we do is a "crypto key gen rsa" if a hostname changes and we
continue on... this regens the keys and stops/starts the SSH process....

Paul



-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Jon Wolberg
Sent: Monday, August 10, 2009 11:53 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] SSH no longer functions after hostname change

Hello-

We recently changed some of our hostnames on various legacy switches to
follow our naming convention, and after one change I can no longer SSH to
the switch.

I get the below errors on the console with debug ip ssh client running:

Aug 10 11:23:44 EST: SSH5: sent protocol version id SSH-2.0-Cisco-1.25
Aug 10 11:23:44 EST: SSH5: protocol version id is - SSH-2.0-OpenSSH_4.3
Aug 10 11:23:44 EST: SSH2 5: RSA_sign: private key not found
Aug 10 11:23:44 EST: SSH2 5: signature creation failed, status -1
Aug 10 11:23:44 EST: SSH5: Session disconnected - error 0x00

I zero'ized the old keys and re-generated as well as set the hostname back
to the original and zero'ized and re-generated to no avail.  Nothing shows
up on Google and I can find no errata related to SSH access on the version
of code we are running.

Has anyone encountered this before?  This is a 3750 running 12.2(44)SE2


Jon Wolberg
Systems Engineer
Virtacore Systems Inc.
"We Virtualize IT!"
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