Hey, I just noticed this topic after I had posted my own, here was what I posted.
Hello everyone. For the last two days I cannot connect to the halo 4 servers. I have tried resetting my modem etc nothing works. when i log in to the game and go to spartan ops or mathmaking i get a message saying "The halo 4 servers are not available. please try again later. mathmaking has switched to the default playlist" When I try to join a friends party I also get the message saying "Could not be added to the party queue" I figured giving it a day or two may fix it, but it has not and I am still unable to play on the main servers or participate in spartan ops. I also verified my network settings and my NAT rating is set to "open". I have friends a few doors down from me having no issues getting on the servers so I am not sure whats going on. Any help would be appreciated.