[External] [c-nsp] Cisco 6509-E SSH and Telnet not allowing connections

Hunter Fuller hf0002 at uah.edu
Sat Feb 27 15:31:22 EST 2021

I have no idea, but just curious, does the box respond to other
control plane traffic from outside, like pings?

Hunter Fuller (they)
Router Jockey
VBH Annex B-5
+1 256 824 5331

Office of Information Technology
The University of Alabama in Huntsville
Network Engineering

On Sat, Feb 27, 2021 at 1:05 PM Lee Starnes <lee.t.starnes at gmail.com> wrote:
> Hello all,
> Ran into an issue that I can't seem to resolve and really don't want to
> reboot the chassis. Have 1 of our 6509-e units that has decided it is not
> going to allow connections to it via ssh or telnet. I can get access via
> console. When trying to connect, you do not get connection refused. You
> just hang for several seconds before getting a connection timed out
> message.
> On the switch, I show no connection attempts.
> A check to see if the ssh server is running and have any connections shows
> normal.
> #sh ip ssh
> SSH Enabled - version 1.99
> Authentication timeout: 120 secs; Authentication retries: 3
> #sh ssh
> %No SSHv1 server connections running.
> %No SSHv2 server connections running.
> Doing debugs, I see nothing show up for connection attempts. Also if I
> attempt to connect to itself from itself it also just hangs before getting
> a connection timed out message. I would expect the normal response of
> connection refused when trying to connect to itself.
> There is an ACL in place on the VTY lines and even removing that, still
> gets the same results. I have removed the input transport on the vty lines
> and then read added them.
> Is there anything else I can try before having to reboot/switch to the
> standby SUP?
> This was all working normally until sometime around 4am. and nothing was
> logged before or after the issue started other than my login via console
> and various changes/commands issued in an attempt to debug/resolve this
> issue.
> Any help would be greatly appreciated.
> -Lee
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