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    <p>Yes, this is correct behavior. </p> <p>When you get connected to the host system first time, the ssh at your client machine ask you if the machine with fingerprint bla-bla-bla really the one you are wanted to connect. You replied 'yes' and ssh at your client machine memorized the host name, IP and the fingerprint in the file ~/.ssh/known_hosts. Then during all subsequent connections it verifies that the fingerprint is not changed as a change is an indication that the authentication process requires your attention. There could be a few valid reasons of a mismatch: </p> <ul> <li>you re-installed sshd at the remote host; </li> <li>your host uses DHCP to get its IP and the IP got changed.</li> </ul> <p>The case when you know precisely that the fingerprint should not change indicates to you an attempt to make you get into another system.</p> <p>This mechanism aimed to make you sure that you are logged in to the system you are expected to log in.</p> <p>In your case you first log into the system at IP a.b.c.d at port 22. Then you try to log in with the same IP a.b.c.d at port 5555. There is your VM behind this port that is having different fingerprint. So ssh complains.</p> <p>The solution for your problem will be to log in to the host system and then from this remote shell session into VM. Also I would recommend you to generate another pair of public/private keys for this 'remote' connection. Thus when your private key kept at the host get compromised then your private key that is kept at your workstation remains valid.</p>
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    1. CO@ Serge Hi, thank your very much for the reply. It makes sense. So the fingerprint is with ip ,regardless of the port?:< But I am not quite understand what you mean by saying "and then from this remote shell session into VM". I want to write a script in the client machine doing this automatically(ideally without any human interaction). Can you provide more details :>
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    2. COYes, regardless of the port. "But I am not quite..." You log into the host system and you type `ssh your-vm-address` command at remote system's shell command prompt. As for automation of the process try at your workstation this command: `ssh root@your-remotehost 'ssh your-vm-address'`
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