

I don’t have anything to help you, other than to say you’re probably onto it being something specific about your router wanting more info from the reverse proxy. I have an actiontec modem I proxy behind nginx proxy manager and it works fine without any additional configuration, though.
What I really wanted to comment on was my surprise that everyone in a self hosting community assumed you were exposing that to the public when you absolutely did not say anything that implied it. Do none of you reverse proxy your local services? It’s wonderful!
Edited to add: actually, what cert are you using? I recently switched to a wildcard cert via DNS challenge from Let’s Encrypt and everything has worked better since then.






The setup I have does require a domain name, yes. I DNS challenge through cloudflare at the moment to get a wildcard cert for *.domain.tld and use that for my local services, including my modem, to serve with https.