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

[Lee Starnes]

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