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

[Jon Wolberg]

Hello-

Nothing, they are all identical switches running the same IOS.


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


----- Original Message -----
From: "Eninja" <eninja at gmail.com>
To: "Jon Wolberg" <jon at defenderhosting.com>
Cc: "Paul Stewart" <paul at paulstewart.org>, cisco-nsp at puck.nether.net, "Eninja" <eninja at gmail.com>
Sent: Monday, August 10, 2009 3:49:35 PM GMT -05:00 US/Canada Eastern
Subject: Re: [c-nsp] SSH no longer functions after hostname change

Jon,

What is different with respect to software version, SSH config &  
platform between this swtich and the dozen others that (could be  
seeing a similar problem but) aren't?

-Eninja



On Aug 10, 2009, at 6:19 PM, Jon Wolberg <jon at defenderhosting.com>  
wrote:

> 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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