Can't connect my client to Server App on my NGinx Server [closed]

I have an x86_64 server program that I'm trying to reach via port 6191 on a server configured with NGinx. The program starts, and the server says that its running on that port. However, whenever I try to connect to it, I get connection failed on my client app. I've tried setting different configurations and allowing UDP specifically for that port in the firewall (at least that's the protocol sudo lsof -nP says it uses.) It did run just fine before I installed NGinx, so I know it's possible and probably a configuration issue. I'm not quite sure what to do.