Same here buddy. I contacted my network admin as I think it's down to the NAT type but he told me that there's no way around it without it being a security risk. He said technically he could enable uPNP but again this would be a security risk and I'd have to clear it with the site manager first. He then went on to say that even IF I manage to get the site manager to agree I'd be looking at a £200 fee for maintenence. All my other games work great, I'm sitting in a 60 mb/s connection and I don't get kicked from any other game... bungie sort it out its beyond a joke.