How to open a port in Ubuntu / Linux

Its very simple please open terminal.

then put this code >

Its very simple please open terminal.

then put this code >

Its very simple please open terminal.

then put this code >

   iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport (port number) -j ACCEPT

Suppose you want to open port 80 do this

  iptables -A INPUT -p tcp -d 0/0 -s 0/0 --dport 80 -j ACCEPT

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