I am trying to set up an internal QNAP device as an FTP server. Unfortunately, I am having problems with the port forwarding settings in the SMC. I currently have the SMC set with the DHCP distribution OFF, and the necessary ports opened with an internal Linksys E4200 handling the DHCP and firewall inside my network (which I also have set with the necessary ports forwarded). I am using DYNDNS to access the qnap device (or TRY to) from outside LAN. But unfortunately, I can't "see" inside the network.
Welcome Touchstudio. I will need a bit more information. Can you view the internal network when connected to the Linksys using a Linksys IP? Are you attempting to connect externally from a device not connected thru the SMC? Which port are you using for QNAP device?