Gitea disabled by firewall?

Regarding my previous post: Unable to commit files to Gitea instance running on a Docker container

I also get the following error using the Gitea UI:

When I join my Windows 10 host to my Wi-Fi hotspot on my phone, everything works. My question is what with my wired internet connection may be blocking this? I have disabled all port blocking in my firewall. I don’t have any proxies etc. Do I have to setup an sort of port forwarding?