I have a game server hosted on a certain port in Ubuntu, which is port forwarded. Users from other places can successfully connect to that server. However, I can't connect to it from another computer within the same network. both computers are connected to the same network Router (F660 ZTE). I'm trying to connect from a Windows 10 PC. I've modified all the relevant firewall rules to no avail. It seems like a complete inability to connect, not just the client being denied access, as there are no indications of getting blocked out in the logs.
When I ping the server, there is just a total lack of communication, no connection until the pings timeout. This happens the other way arround as well.
For a while I managed to fix it by connecting using the local ip, but the problem suddenly came back again. Now I can't reach it in any way, be it the external or the internal IP.
Client OS: Windows 10
Server OS: Ubuntu 16.04 LTS
Game: Minecraft
Router: F660
Edit:: More research suggests this has something to do with "Hairpin NAT" or similar, but I don't know what to do afterwards
Exit 2: This isn't a duplicate, my problem wasn't fixed by that other question. I now added to my client's hosts file a rule so "yeet.com" is taken as the internal ip of my server, but the problem wasn't fixed.
Edit 3: No, those answers don't work. Uisng the internal ip is NOT a workaround in my case, but it seems to be a workaround in their case. Even connecting through internal ip is impossible
