In this lazy IT world it can happen often, that somebody forget to log out from a device. If all VTY will be busy, you will not able to log into the device anymore, you’ll get the following output back:
telnet kcorp_lab_r1 Trying 10.210.8.51... telnet: Unable to connect to remote host: Connection refused
This error message can mean different things:
- telnet is not enabled
- your IP has been filtered by an ACL
- all VTY is full
Then what can we do?
If we can connect to the device earlier, it’s almost 100% sure that it’s a VTY issue. All lines are busy.
Here is the solution! If we have read/write snmp community configured on the device, we can use our snmp server to clear the line.
Check the lines
snmpwalk -v 2c -c <RO community> <destination_ip> 220.127.116.11.18.104.22.168.22.214.171.124
The results of the command will display all lines on the device.
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