Internet drops when i try to join a friends game lobby

[Vazyo]

Whenever i try to join a specific friends game such as civ 5 or Terraria, my internet drops until i leave the lobby and then it comes back up. I've tried resetting my router but nothing seems to help this problem, its been going on for around 2-3 years.

What can i do to fix this.

 

[dexxterlab97]

You must be really patient for not finding a solution all these years. Have you tried reinstalling the game? Do you join the exact same friend?

 

[Vazyo]

Yea it only happens on certain games and its always the exact same friend. From my experience it only happens on games that are hosted by the player and not by the game. I've tried uninstalling but it doesn't help.

 

[schwatzz]

Seems like it could be a port fowarding issue or firewall issue.

 

[Vazyo]

I've tried disabling my firewall all together but it didn't help. as for port forwarding I'm not sure why it would only happen with this one friend, never happened with anyone else before

 

[newbcakes]

traceroute, wireshark, netmon... what ports are in use? When you say your "internet drops" does that mean you lose connectivity to everything?! google.com will not come up? Do you know what ports the games use?

 

[Vazyo]

Yea i lose connectivity to everything, the internet in my whole house goes down when i try to join. not too sure about the ports, id have to look that up.

 

[Vazyo]

Ok, so i managed to fix it somewhat i guess. I downloaded Hamachi and we seem to be able join each other now.

 

[newbcakes]

I might get my hands on wireshark:

launch your game, get to the connection menu, don't connect yet
alt+tab and get back to your desktop
launch wireshark, start a trace
alt+tab back into your game, try to connect like you would normally, presumably it fails
alt+tab into wireshark, stop/pause the trace
save it to your desktop if you want.

You may or may not be savvy with network traces, but with minor skills, you can look at the network traffic as it tries to communicate. You may also be able to copy/paste a portion of the output here (ideally filtering out the "noise" and only looking at traffic between your system and the game server). Be sure to obscure the IP/MAC addresses if you do.