https://stribika.github.io/2015/01/04/secure-secure-shell.html
https://www.sshaudit.com https://github.com/evict/SSHScan
https://www.ssllabs.com/ssltest
https://observatory.mozilla.org
https://ssl-config.mozilla.org
Warning: the ECDSA host key for '<host.domain.net>' differs from the key for the IP address '<ip address>'
# ssh-keygen -R <ip address>