• Fixing The Host Key For Ssh Connection

After that I was successfully able to generate SSH keys on my client computer, moved the public key to ~/.ssh/authorized_keys on the Mac and set permissions for that file to 644. It is important to note that those permissions are for my public key.

Advertisements $ ssh username@123.123.123.123 Here is an example of what the warning you receive might look like: @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ @ 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 01:23:45:67:89:ab:cd:ef:01:23:45:67:89:ab:cd:ef. Please contact your system administrator. Add correct host key in /Users/username/.ssh/known_hosts to get rid of this message.

Offending key in /Users/username/.ssh/known_hosts:369 RSA host key for 123.123.123.123 has changed and you have requested strict checking. Host key verification failed.

What does that mean? It is “only” a warning but hinders you in logging in to the host.

This means that the host identification (fingerprint) you accepted when you logged in for the first time does not match the fingerprint on this connection attempt. As the message states, that can be a man in the middle attack, but – as in my case – this also happens when you have re-installed your server. The IP/DNS name is the same, but the fingerprint has changed.

If you know this is the reason, you will need to remove the old host-key/fingerprint and then on the next login attempt accept the new fingerprint. Possibility one On OS X, edit the file ‘/Users/username/.ssh/known_hosts’, go to the line the message told you and delete the line (make sure it is really the right line that you delete). Possibility two The easier way is to just run a command which will do the editing for you. It will create a backup of the old known_hosts file as /Users/username/.ssh/known_hosts.old.

Of course if you edit it twice, it will override the first backup. To do this run the following: ssh-keygen -R 123.123.123.123 Accept the new fingerprint Try to login now and you will see the following output asking you to accept the unknown host’s fingerprint: The authenticity of host '123.123.123.123 (123.123.123.123)' can't be established. RSA key fingerprint is 01:23:45:67:89:ab:cd:ef:01:23:45:67:89:ab:cd:ef. Are you sure you want to continue connecting (yes/no)?

After you have accepted the new fingerprint, it is stored permanently in the known_hosts file. Unless the fingerprint changes again, ssh will not prompt you about it again. Read more of my posts on my blog at.

Windows RELATED: Windows still doesn’t offer a built-in SSH command. Microsoft made some noise about integrating an official SSH client into PowerShell back, but we haven’t heard much about it since. So the most popular and widely recommended solution for connecting to SSH servers is an open source, third-party application called PuTTY. And launch it to get started. You can download either an installer that included PuTTY and related utilities.

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Fixing The Host Key For Ssh Connection

Or a putty.exe file that can function as a. Type the host name or IP address of the SSH server into the “Host name (or IP address)” box. Ensure the port number in the “Port” box matches the port number the SSH server requires.

SSH servers use port 22 by default, but servers are often configured to use other port numbers instead. Click “Open” to connect. You’ll see a security alert the first time you try to connect to a server. This tells you that you haven’t previously connected to this server. That’s expected, so click “OK” to continue.

If you see this warning in the future after already having connected to the server once, that indicates the server’s encryption key fingerprint is different. Either the server administrator has changed it or someone is intercepting your traffic and trying to trick you into connecting to a malicious, imposter SSH server. You’ll be prompted to enter the username and password for your account on the SSH server. After you do, you’ll be connected. Just close the window to end the SSH connection. There’s a lot more you can do with PuTTY. For example, if you need to use a private key file to authenticate with the SSH server, you’ll find this option at Connection > SSH > Auth in the PuTTY Configuration window that appears when you launch the application.