I’m not an expert on networking but that’s the verdict I get when pasting this problem to ChatGPT. We did have this and went away when we activated IPv6. Firefox and depending on your network/OS you might access the site via IPv6, in which case it will fail if it’s not accessible. I still have problem accessing it locally, curl fails, it works when I am in the network, so I don’t know what’s the case here. It works for some and not for others? Super weird.