http://www.pinceladasdaweb.com.br/blog/2014/01/13/como-configurar-firewall-ssh-terminal-no-linux/
Sorry for my English
Servers
VPS firewall this method
VPS firewall this method
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tontonEd: -A INPUT -p udp --dport XXXX -j ACCEPT
-A INPUT -p tcp --dport XXXX -j ACCEPT
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