Question about D-Link DFL-800 Firewall

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FTP problems. We have a problem to FTP to our FTP server outside the network. The problem accours if we try to send more then 1 file. Between the both files FETCH ftp disconnect our connection to the FTP server. We have tryed to connect outside this network and have no problems wih that.  We have put up the FTP_passtrough rule from LAN to CORE. Any idea what could be te problem?

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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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inserted properly.
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