How do I automatically accept SSH host key?

To automatically accept the SSH servers fingerprint and add it to the known hosts file we can pass the StrictHostKeyChecking no option to SSH. As you can see, SSH displayed a warning telling you that it added your host to the known hosts file.

How do I get SSH fingerprint information?

You can list the fingerprint of the keys by ssh-keygen -l -f /etc/ssh/ssh_host_key. pub though you will need to repeat this for each public key. ssh-keygen does not generate the SSH fingerprint at your server.

What does host key verification failed mean?

3. +1 “Host key verification failed” means that the host key of the remote host was changed. Ssh stores the host keys of the remote hosts in ~/.ssh/known_hosts. You can either edit that text file manually and remove the old key (you can see the line number in the error message), or use ssh-keygen -R hostname.

How do I fix host key verification?

How to Fix It

1. First locate your ‘known_hosts’ file, and open in a general text editor.
2. Remove the line containing the host name of the server you failed to connect to.
3. Save the known_hosts file after removing the offending key line.
4. Attempt to establish the SSH connection again.

What does it mean when SSH says accept new host?

If this flag is set to “accept-new” then ssh will automatically add new host keys to the user known hosts files, but will not permit connections to hosts with changed host keys.

What to do if you have a key mismatch in SSH?

Similarly, when a key mismatch occurs, we use the ssh-keygen command to remove the old key from the file ~/.ssh/known_hosts. After the removal of the key by using any of this method, the remote server asks for a confirmation to add the new key to the ~/.ssh/known_host file. It indicates the successful removal of the old key.

What happens if the SSH host key is unknown?

By default, the SSH client verifies the identity of the host to which it connects. If the remote host key is unknown to your SSH client, you would be asked to accept it by typing “yes” or “no”. This could cause a trouble when running from script that automatically connects to a remote host over SSH protocol.

How can I get SSH to accept new keys?

ssh(1): expand the StrictHostKeyChecking option with two new settings. The first “accept-new” will automatically accept hitherto-unseen keys but will refuse connections for changed or invalid hostkeys.