I got a friend round who work as a IT consultant and we ‘ Tried it without the WAN cable. Even without the WAN cable it was hit and miss if the connection would stay up. The router would keep dropping the connection as though it was turning the port off then back on. When it was finally stable, we couldn’t get to access the web interface, so he decided to run a port scan which only showed port 22 open, port 80 or any other port that could be used for the web interface wasnt open.
please advise