Yep, me too. It says “fully accessible” for a few seconds, then says “not accessible”.
I have tried every permutation I can think of. I have followed the “definitive guide” and added Windows Firewall rules for virtually every port involved. I’ve turned on and off various port forwarding options in my router, on my VPN, etc. The computer NEVER goes to sleep, so that’s not it.
The best I can get is this on for a few seconds, off again behavior. And it works for some use cases (apparently via the Web interface, sometimes via TiVo, never via Roku). Is there a definitive guide to diagnosing the problem?