I already setup the filezilla server according to the Network configuration page for passive connections, specified ports 50000 to 51000 and entered he global IP address in filezilla server, add exeptions in the firewall.
You did not mention that in your post.
FileZilla Server requires forwarding TCP ports, the listening one (default 21 but can be changed) and data ports for Passive connections.
Define - You must enter the range into FZ Server's Passive settings so it knows which ones it can offer in the Passive reply.
Open - Local firewalls often like to block the Passive ports despite the application service itself being allowed. Reason is unknown, but then you need to open these ports separately.
Forward - You did that in the router already. Please use static forwarding and not Port Triggering/Virtual Server.
I am able to connect through Remote Desktop to my server giving it a TCP=3389 in the virtual server tab, but when I made that change in the port forwarding tab I lost connection with the remote desktop and now I am not able to make any connection what so ever with the filezilla client.
The Virtual Server may do further things you may not notice. The RDP feature may benefit from that, but FTP traffic has to pass largely unfiltered, it is very fragile in this regard.
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FTP connection problems? Do yourself a favor and read Network Configuration
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