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How to open port 21 on Linux server?

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linux-howto

http://askubuntu.com – I installed vsftpd in my Linux Server 12.04. Unfortunately my firewall closed port 20 and 21. So I used the commands found here and other commands to open my ports. But I tested with nmap and I saw ports didn't open. What can I do? I need to open these ports. (HowTos)