I can't believe I am having trouble with one of the most basic functions of a router. Port forwarding does not work to non-standard ports on this device. Here is the situation. I have a device that I need to access behind the RUT240, it runs on port 7998. As a test I have a laptop running a web server on port 7998 plugged into the LAN port. I am accessing it via the 4G interface. I know my port forwarding configuration is correct because if I change the port forwarding rule to port 80 and reconfigure the web server to port 80 I can get to the web server via 4G across the internet. However as soon as I change it to 7998 or 8080 I get nothing. This is frustrating beyond belief. Now I am stuck with four of these routers that don't function as well as a $50 Walmart router.
I have tried five different firmware versions from as far back as 2020 and then obviously the most current version. No matter what it does not work except on the standard ports 80 and 443 which doesn't help me at all.
I appreciate any thoughtful input.