Model :

Hardware Version : Not Clear

Firmware Version :

ISP :

Hello, I setup the FTP in the USB Settings/Folder Sharing.
The local (LAN) access of the FTP server works fine, but when I try to access via Internet it doesn't respond.
When I try to Port Forward let's say port 21 to the router IP address I receive an error (Error code: 25004 The port of the virtual server is conflicting with that of the FTP server.).
It only works if I enable DMZ with the router LAN IP Address. But if I do that not only the FTP server works but also the HTTP router configuration server. So in this case I'm publishing in Internet my router config.
Any one had this problem ?
Thanks