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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.

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What firewall are you using? –  saji89 Aug 8 '12 at 10:59
    
What firewall software are you using? –  Mitch Aug 8 '12 at 11:00
    
My firewall is iptables –  Peyman Aug 8 '12 at 11:06
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Try ufw allow in ftp –  Cumulus007 Aug 8 '12 at 12:18
    
Some ISPs block ports 20 and 21, did you make sure your ISP allows them? –  Thomas W. Aug 8 '12 at 16:54

2 Answers 2

Sometimes a port will need to be forwarded from the router (take a look at port forwarding), or perhaps port 21 is already pointing to something else on the network?

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On the website there was these 2 lines

iptables -A INPUT -p tcp --dport 21 -j ACCEPT
iptables -A INPUT -p tcp --dport 20 -j ACCEPT

After that you may need to restore your iptables rules with:

iptables-restore < LOCATION_OF_IPTABLES_RULES_FILE
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Thank you but dosn't work. terminal sey to me:: -A: command not found –  Peyman Aug 8 '12 at 12:14
    
Instead of -A please try it with -I –  j0N45 Aug 8 '12 at 12:16
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Dosn't work. but I can solved my problem, I wrote 'iptables -F' in terminal and 'Listen 21' in /etc/apache2/ports.conf and then restart apache. Thank you –  Peyman Aug 9 '12 at 9:24
    
Make sure your ISP allows you to use those ports, there are ISPs that will block those ports automatically. –  Thomas W. Mar 2 '13 at 20:37

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