https://docs.ovh.com/it/dedicated/mettere-in-sicurezza-un-server-dedicato/
https://arstechnica.com/gadgets/2012/11/how-to-set-up-a-safe-and-secure-web-server/
https://www.digitalocean.com/community/tutorials/how-to-set-up-a-firewall-with-ufw-on-debian-9
https://www.html.it/articoli/ufw-configu...
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