I have the same problem. Sometimes, it lets me in game for a few minutes then kicks me out other times it instantly gives the message after the start screen. This all seems to have started after I pledged to New Monarchy on my Titan after I had Dead Orbit pledged to on my Hunter. I don't see the correlation. It would be really useful if Buffalo would give you more information on what triggers it whether it be a bad TCP/IP port, Blizzard service disconnecting, or 2 services attempting to use your account at the same time. If anything, I hope all of these reports "encourage" Bungie to look into a fix. My connection is wired: Router ->(Cat-6) Switch ->(Cat 5e) Computer, so packet loss should be minimal. The closest that I remember getting was clearing the DNS cache, but the error came back quickly. If anyone has any working solutions tell us! (And for solutions that are deleting "cvars.xml" understand that you will have to reset your settings, because that is where they are stored) Update: For some reason my hunter was fine and worked for at least 1 hour. I'm going to try my titan before coming to any conclusions. Update 2: My titan hasn't had any issues for at least an hour. I think releasing my ipconfig and renewing it may have helped.