If you’ve changed keys, you will need to delete a ssh key from /etc/known_hosts file.

You can edit it manually using an editor such as vi or vim.

<pre lang="bash">vim ~/.ssh/known_hosts

Or you can use ssh-keygen command with -R option to delete the hostname or IP address.

<pre lang="bash">ssh-keygen -f "~/.ssh/known_hosts" -R "xxx.xxx.xxx.xxx"