Marco Moock via cisco-nsp wrote on 11/12/2025 11:48:
Certain Cisco models (in my case 800 series, e.g. C886vaw, 886w etc.)
have telnet services on port 2001,4001,6001 and 9001.
What is the preferred way to disable them entirely (not firewalling
them), but keep telnet and ssh?
This isn't telnet-to-the-device, it's remote access to physical ports.
You can disable it easily using e.g. for serial console:
line con 0
transport preferred none
You'll need check which access lines are defined on each device and then
disable them using "transport preferred none".
Nick
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