Since this conflicts with the stored key on your machine ssh will ask if you still trust that machine. The first time you connect to a machine ssh will ask you if you trust that key. If you do then that key is copied to the knownhosts file for that user. Look in the knownhosts file and remove the entry for the remote machine. I have had some trouble sshing into any AWS EC2 instance the past few days. Last Wednesday (four days ago) I was able to log into an EC2 just fine and install Jenkins using Docker. Thursday morning I tried to log into the same EC2 and received 'Host key verification failed.' Since then I have tried the following.

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What happens in background when you connect a server first time using ssh

When you connect to a server for the first time, the server prompts you to confirm that you are connected to the correct system. The following example uses the ssh command to connect to a remote host named host03:

Host validation is one of OpenSSH’s major features. The command checks to make sure that you are connecting to the host that you think you are connecting to. When you enter yes, the client appends the server’s public host key to the user’s ~/.ssh/known_hosts file, creating the ~/.ssh directory if necessary. The next time you connect to the remote server, the client compares this key to the one the server supplies. If the keys match, you are not asked if you want to continue connecting.

What causes host key verification failed error

If someone tries to trick you into logging in to their machine so that they can sniff your SSH session, you will receive a warning similar to the following:

If you ever get a warning like this, stop and determine whether there is a reason for the remote server’s host key to change (such as if SSH was upgraded or the server itself was upgraded). If there is no good reason for the host key to change, do not try to connect to that machine until you have resolved the situation.

How to correct the “host key verification failed” error

Method 1 – removing old key manually

1. On the source server, the old keys are stored in the file ~/.ssh/known_hosts.

2. Only if this event is legitimate, and only if it is precisely known why the SSH server presents a different key, then edit the file known_hosts and remove the no longer valid key entry. Each user in the client/source server has its own known_hosts in its home directory, just remove the entry in the file of a specific user for the destination server. For example:
– If root wants to ssh to the server, just removing entry in the /root/.ssh/known_hosts file is all right.
– If testuser wants to ssh to the server, then remove the entry in the file /home/testuser/.ssh/known_hosts.

3. In my case, I will remove the the key (highlighted in red) for the destination server 192.168.219.149 from the file /home/user01/.ssh/known_hosts.

Method 2 – removing old key using the ssh-keygen command

You can also remove the old key using the ssh-keygen command as well. The syntax to use the command is below.

For example, In our case we will use the IP address to delete the old key.

Verify

If the remote servers asks for a confirmation to add the new key to the ~/.ssh/known_host file, it confirms that you have successfully removed the old key. If you confirm the request, the source machine adds the new key into the ~/.ssh/known_host file.