topic Re: SSH stopped working in Network Security

SSH stopped working

ttieuropecco — Mon, 11 Mar 2019 13:01:45 GMT

Hi,

i encounter the problem not be able to ssh to my ASA5510 anymore. the log shows a entry with "Resource 'ssh' limit of 5 reached for context 'single_vf'". i found already some posts on the internet stating to regenerate the rsa key. i did it with "crypto key generate rsa modulus 1024", but this didn't helped a bit. i'm still getting the error in the log and not able to ssh to it. i found a post saying to 'zeroize rsa' first, but i have no idea how to do that. any suggestions?

ct,

Re: SSH stopped working

Collin Clark — Thu, 19 Jun 2008 15:36:35 GMT

The only way I've been able to SSH again is to reboot the firewall. I've been waiting for it to happen again so I can open a TAC case. Maybe you could do that and let's us know what Cisco says?

Re: SSH stopped working

jbatluck — Thu, 19 Jun 2008 17:23:24 GMT

I think I've had this happen to me before, and I think rebuilding the keys worked. I believe that on 6.3 the syntax is "ca zeroize rsa". I don't see it in the command reference document for 7.2, but that doesn't mean it's not there. Hope it works for you.

Re: SSH stopped working

Collin Clark — Thu, 19 Jun 2008 17:38:02 GMT

FYI-

To remove the keys on an ASA device.

ASAOne(config)# crypto key zeroize rsa default

WARNING: The default key pair will be removed

WARNING: All device certs issued using these keys will also be removed and

the associated trustpoints may not function correctly.

Do you really want to remove these keys? [yes/no]: yes

ASAOne(config)#