I have to log on to a server via a specific port (with -p), i.e,

$ ssh -p 10233 root@9.1.3.453

Once I did that, it asked me to accept connection.

Then I try to connect to other port of the machine, says 10234

$ ssh -p 10234 root@9.1.3.453

This is not working unless I delete the 9.1.3.453 line in the
.ssh/knownhost

Is there a way to connect to the machine without having to remove the content in the knownhost?

Try adding a hostname and alias for this system /etc/hosts. Then use one hostname for first port and the other hostname for the second port.

hmm I don't have this issue, I just tested with using the same hostname and then using the ssh servers ip address.


Can you paste the error?

You could [sym]link ~/.ssh/known_hosts to /dev/null maybe

Here is the error mesg.

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that the RSA host key has just been changed.
The fingerprint for the RSA key sent by the remote host is
5e:83:44:90:20:99:7a:d0:6a:4a:d5:68:86:23:4a:9d.
Please contact your system administrator.
Add correct host key in /home/user1/.ssh/known_hosts to get rid of this message.
Offending key in /home/user1/.ssh/known_hosts:11
RSA host key for 9.1.3.212 has changed and you have requested strict checking.

Hmmmm it should need to be removed again and again, that machine will only have 1 key.

Do this, run:

And try again.