Hi Per-Tore,
If you changed it to port 81 and it doesn't work after adding the port to the URL, then you probably have
a port forwarding problem in your router, or a port conflict somewhere in your network with that port number.
Otherwise, I don't see any explanation. It certainly is nothing caused by the RRC and therefore nothing here
we can do to help you, sorry.
73,
Mitch DJ0QN / K7DX