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

[Lee Starnes]

Hello Hunter,

It does respond to ping and all other functions are working including
responding to SNMP RO and RW.

-Lee

On Sat, Feb 27, 2021 at 12:31 PM Hunter Fuller <hf0002 at uah.edu> wrote:

> 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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