To find this line we can use the following command:
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router#who
For example a router has a vty connection from a host with ip 10.10.10.10 on line 3:
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router#who
Line User Host(s) Idle Location
2 vty 1 idle 00:00:02 10.11.10.11
3 vty 2 root idle 00:00:06 10.10.10.10
* 5 vty 4 admin idle 00:00:00 192.168.17.67
Interface User Mode Idle Peer Address
Note, your current active connection is marked with '*' asterix. No suicide, pls.
To clear connection on line 3 we use the following command:
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router#clear line 3
[confirm]
[OK]
router#
And check result of our actions:
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router#who
Line User Host(s) Idle Location
2 vty 1 idle 00:00:02 10.11.10.11
* 5 vty 4 admin idle 00:00:00 192.168.17.67
Interface User Mode Idle Peer Address
Another possible solution is to remove connection from the socket table by clearig associated TCB (Transmission Control Block):
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router#show tcp brief
TCB Local Address Foreign Address (state)
51594BC8 192.168.5.1.22 10.11.12.11.45581 FINWAIT1
5158C398 192.168.5.1.22 10.11.10.11.1904 ESTAB
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router#clear tcp tcb 5158C398
