Cisco Bug: CSCtb01537 - CPPr: Telnet port not closed when transport input none is configured
May 31, 2018
- Cisco IOS
Known Affected Releases
Symptom: When telnet service is disabled via "transport input none" configured under the vty lines, the TCP port 23 still shows up in LISTEN state in show control-plane host open-ports output: Router#show control-plane host open-ports Active internet connections (servers and established) Prot Local Address Foreign Address Service State tcp *:22 *:0 SSH-Server LISTEN tcp *:23 *:0 Telnet LISTEN Conditions: This affects all 12.4T IOS releases supporting Control Plane Policing up to 12.4(24)T1. Affects 15.2(4)M1 as well.
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