Did you actually lose connection or did the green just turn to red in the remote connection screen?
I’ve heard of this happening a lot and it happens to me all the time: the green turns to red and says no remote connection, but it works fine from outside my network. I think it’s a bug - I’ve seen posts about this problem over a dozen times…
I have the same Problem. My Xfinity Modem has gotten replaced recently and after it had gotten replaced my external network card wouldn’t connect. So I had to go to my onboard network port and now like you my Port Forward is giving me the same problem.
It will connect for about 15 min and rapidly disconnect…
I am able to get a connection to my server from my Cell Phone and Smart TV but others that I am sharing with cannot