I have successfully set up an FTP server with this router.
Port forwarding does work.
I can access my home FTP from work. Also, I have set up Remote Desktop, both work.
For the server, I use FileZilla server.
For the client, I use FileZilla. But, I have to make the connection "Active", not "Passive".
(Site Manager/Transfer Settings Tab/Transfer Mode/Active)
I hope this helps.