I can always connect to the device through RMS (and lease a working Web UI). I have a static IP-address for the wired device I want to reach. I have set up a port forwarding on port 443 to the static IP address. Before setting up the DynDNS-feature, I am using the Public IP that shows in the RMS to connect to the *ip*:443. When using the public IP with port 443, the error message in the browser says it took to long to get an answer.
When connecting my pc through wireless, I get connected to the router, but get "No Internet Access".