Question about D-Link DFL-800 Firewall
There are 2 ports used for FTP. They are 20 and 21. When you initiate a connection that occurs on port 21, but data traffic is on port 20. Your firewall sees your outside FTP server trying to 'initiate' a connection on port 20 and breaks the connection to that IP address.
What you need to do is either use 'passive' ftp or open both ports 20 and 21 for ftp traffic in the firewall.
Posted on Apr 29, 2009
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Posted on Jan 02, 2017
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