Ok, the official answer from tp-link support seems to say that NAT loopback is not supported by the ER605! This should be supported by this kind of product, no ? Can anyone recommend a product that...

@Tedd404 The DNS are the one the ISP provides. Weird fact, I don't know if it's related, but the linksys gets the static IP and everything (DNS, gateway, subnet mask) automatically. The tp-link does...

@btx There's no DNS server on our old linksys, but it works. Since the domain is pointing to our IP, the router should keep the traffic on the local network. No DNS is required internally, it's NAT...

@Tedd404 Yes. The server is internal, but when a computer on the local network goes to the URL of the server, we see that it goes through the web to serve the webpages. We see it because: 1. it's...

Tried updating the firmware to: ER605(UN)_v2_2.0.1 Build 20220223 The problem is still there, tried many settings, cannot make it work. Is there people from tp-link reading this forum ? Thinking of...

@Somnus Yes, websites work from outside. Works from inside too, but go through the Internet to access it instead of staying inside the network. Will try to update the firmware today. Thanks.