Vivian wrote NAT Boost is enabled, right? There is a beta firmware to solve the loopback issue. You can contact TP-LINK people to ask for it. Good luck....

I am not sure what the moderator did to my original post. The Netherlands is region Western-Europe and I am having issues with a brandnew TP-Link Archer C9 V1 firmware 3.15.27 Build 20141013...

Region : Argentina Model : TL-WDR4300 Hardware Version : V1 Firmware Version : ISP : I have a domain www.makkink.eu with my ISP with a fixed IP address (212.84.x.x), and I have a web server in my...