close ssh connection with keygen

Question

I've established a port forwarding using an ssh connection to my remote server using keygen as codes below :

ssh-keygen -t rsa and ssh-copy-id -i ~/.ssh/id_rsa.pub root@IP

ssh -N -R 0.0.0.0:53407:localhost:53407 root@IP

Now i need to end this but still my port 53407 is using by ssh , how can i end this connection?

return of lsof -i -P -n | grep LISTEN

Ive deleted the port forwarding service yet nothing changed

Answer 1

• In the "dead" terminal, where you started the ssh -N ... you can just press Ctrlc to cancel the ssh process.
• If you sent it to the background get the job back to the foreground to send it a ^C.

# At the client system:

# To find it:
jobs
[1]+  Running                 ssh -N -R53407:localhost:53407 user@server &

# To bring to foreground:
fg 1

# To cancel:
^c

• Else find the ssh process in your task list, get its process-id (PID) and execute:

kill <PID>

Using kill like this is not an assassin at work but more like a nice postman that hands out the message to ssh to quit itself properly. — So give ssh some seconds to do the quit-job.

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Preferably you should check the open ports by ss:

# At the remote system:
sudo ss -tanp | grep "sshd"

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This will also help, when you are local at the server to terminate the ssh connection:

# Alternatively at the server:
sudo ss -tanp | grep ":53407"

LISTEN  0       128                 127.0.0.1:53407     0.0.0.0:*       users:(("sshd",pid=247750,fd=9))                                               
LISTEN  0       128                     [::1]:53407        [::]:*       users:(("sshd",pid=247750,fd=8))                                               

# Get the PID from the output and send the kill command:
kill 247750

Note: Other sshd connections will not quit, as sshd forks for each connection, so using a different PID for each of them.