Help with proftp

Ok im just wondering, what ports do you need open for proftp to work

I thought it was just port 21 but when i have an iptables script running that just keeps open port 21 80 and a few others, it get this problem

When using ftp client, it will connect, but when i try to drag and drop files its says 'cannot connect to socket'

then when someone tries to connect to it through a browser, it wont even connect, and it will just say

cannot connect to socket

Is there another port i need open?

Thanx

 

 

 

 

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