[c-nsp] Loss of Telnet Capability to 6509

[Mike Sawicki]

On Wed, Jul 28, 2004 at 11:00:32AM -0700, Richard J. Sears wrote:
> We have a 6509 running a SUP720 in IOS only mode (no cat os). 
> 
> At around 4am this morning, we lost our ability to telnet to the router.
> Running a tcpdump shows that the router never responds to the telnet
> request. 
> 
> All functions and interfaces on the router seem fine (bgp, etherchannel,
> ibgp, vtp, hsrp) and I can console into the sup with no problems at all,
> we just cannot telnet into it. The CPU is at around 6%.
> 
> I have checked all access lists on the router, none were added/removed
> or modified on line vty that would cause this problem. All logging
> appears normal.
> 
> We are running Version 12.2(17a)SX3.
> 
> Anyone have a similar problem or know how to check or restart the telnet
> process on the router without a reload...?
> 

Make sure you don't have too many active sessions already opened to
the box.  I had a bad experience once where an exec-timeout was set
to 0 and there were already 5 logins, just idling.

Of course this could be a 6509 bug too.. but I just threw the idea
out there for you to check.

Mike Sawicki (fifi at HAX.ORG)