FoxhoundFPS

I forgot to mention that I have 27031-27036 also forwardxed for TCP and UDP.

This is happening to me frequently as well and the issue is hard to repro as the variables are unknown. I have tried adding various NAT Port Forwarding suggestions from third-party sites to both my PC (client) and the host PC. Note: The client and host PC in my situation may be in the same home, but we have seperate modems. Yes, we pay for two seperate modems. Yes, there are two physical modem devices. Just want to make sure I clear that up. Here are the TCP and UDP ports that I have forwarded. 3074-3076 27015 4500 3544 Something to note. When I, the client, am kicked and I attempt to recconect WITHOUT restarting I am met with an error. Below is the flow I take to achieve it. Multiplayer > Join Online Game > [Select Friend] > [Input Password] > "Joining Game..." + Spinning Loading Icon > "Host is loading a save" + Spinning Loading Icon > Connection Lost Notification: "You have lost connection to the host. The host either quit the game or lost connection." If I restart the application, shown in the video below, I can join back onto the host without issue, but this happens frequently which makes the friction of quit/launch/join rather high. Happy to add more ports to the NAT Forwarding if needed.