jon at defenderhosting
Aug 10, 2009, 9:41 AM
Views: 6279
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Re: SSH no longer functions after hostname change
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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>
To: "Jon Wolberg" <jon [at] defenderhosting>
Cc: cisco-nsp [at] puck
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]
Sent: Monday, August 10, 2009 12:20 PM
To: Paul Stewart
Cc: cisco-nsp [at] puck
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>
To: "Jon Wolberg" <jon [at] defenderhosting>, cisco-nsp [at] puck
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
[mailto:cisco-nsp-bounces [at] puck] On Behalf Of Jon Wolberg
Sent: Monday, August 10, 2009 11:53 AM
To: cisco-nsp [at] puck
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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