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https://superuser.com/questions/127863/manually-closing-a-port-from-commandline
https://serverfault.com/questions/594746/how-to-stop-prevent-ssh-bruteforce
https://ubuntuforums.org/showthread.php?t=1967131
http://www.ibm.com/developerworks/library/l-sockpit/index.html
https://it.toolbox.com/question/how-to-check-if-a-particular-port-is-open-080211
https://security.stackexchange.com/questions/32308/should-i-change-the-default-ssh-port-on-linux-servers
https://unix.stackexchange.com/questions/82626/why-is-root-login-via-ssh-so-bad-that-everyone-advises-to-disable-it
https://adayinthelifeof.nl/2012/03/12/why-putting-ssh-on-another-port-than-22-is-bad-idea/
https://support.plesk.com/hc/en-us/articles/115000170174-How-to-change-the-SSH-port-on-a-Linux-server
https://support.plesk.com/hc/en-us/articles/213926725-Websites-do-not-respond-on-80-port-but-respond-properly-on-7080-port-on-Plesk-server
https://medium.com/@jasonrigden/a-guide-to-the-uncomplicated-firewall-ufw-for-linux-570c3774d7f4
https://www.digitalocean.com/community/tutorials/how-to-use-port-knocking-to-hide-your-ssh-daemon-from-attackers-on-ubuntu
https://askubuntu.com/questions/110518/cant-login-to-my-server-via-ssh-and-the-password-is-correct