LMP
Blue Crack Supplier
I'd look into seeing if you can adjust the settings on your router, as it helps a great deal with match making and playing with friends. Sometimes it'll even not let you join certain friends if you have strict NAT settings. Here's a couple links that should help:
Troubleshooting NAT issues
Xbox: The Diagnostic Server shows Network Address Translation (NAT) type problems when using Xbox Live
NSW, how can you worship Horde and not like Coop? Horde IS coop! Looking at it, there are a few coop multiplayer modes on GTA, or we can just free mode, or shoot each other.
Double-splattered!