Answer for:

Catalyst 4500 Series Switch Cisco

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Tks for the replies.

I had verified the vty line configurations and all looked correct.

Powered off switch and restarted. Whatever change that was applied was not saved to the startup-config. (Good or bad - good in this case). When switch came back up - telnet was available again.

Still not sure what the problem was - but now have a backup file of running-config in case this happens again. Also will configure user logon accounts and track what changes are made by who.

Tks again for all replies.