Hi. I bought server hosting with my friends. We all play the same modpack but only I can't join it means I can but immediately after connecting disconnects me. I get a message : "Internal Exception: java.io.IOException: An existing connection was forcibly closed by the remote host." I tried on other computers, reinstalled minecraft, turned off the firewall and nothing. Only after switching to the internet from the phone can I connect. Interestingly, I can easily connect when there are no mods. I will only add that several friends use the same provider. I will only add that on the same modpack I could connect to a friend's local server.
Could this be a network bandwidth problem?