Connection to the game session interrupted PC

Bought the game yesterday and I am unable to do any sort of matchmaking. Online coop firefight and campaign work.
Getting the infamous ‘Connection interrupted’ error.

Some things that I have tried include:

  • Making sure in game network setting relay setting is turned off (fixes for some users) - Checking NAT type and Xbox Networking
  • Typing in ‘xbox live’ into the windows 10 search brings you to settings where it shows networking details but more importantly your NAT Type and Server connectivity. On
    boot up the settings for my NAT type display “Teredo is unable to qualify” and the server connectivity says blocked. There is a button under this that says ‘fix it’ which after pressed and updated, it showed Open NAT and connected to the server.
  • Alternatively, instead of using the ‘fix it’ button there are two links that point to xbox support that show step by step solutions for both of these problems “Teredo is unable to qualify” (seven solutions) and “server connectivity blocked” (six solutions) respectively. Which I have tried all of the above for both. Teredo - Xbox Support Server Connectivity - Xbox Support 3. Uninstalling MCC from HHD and installing it back on SSD for faster load times (reddit user claimed that this worked for a friend)
  1. Port Forwarding Create a Port Forward for Halo: The Master Chief Collection in your Router
  2. Installing the new Firmware for router. (Netgear Nighthawk R7000)
  3. Signing in and out of xbox account (works for other users)
  4. Turning Computer off and restarting router

I’ve tried different combinations in the order of all these things I listed after rebooting, still no luck. The weirdest finding of all is that I was able to solo queue into a single CE match in the middle of all this testing, just a taste of glory. Almost all tests were done for halo reach matchmaking including firefight because that is what I was trying to play with friends at the moment. A typical disconnection would look like, me finding others in a lobby and once the game started I would at most get three quarters of the way into the loading progress bar then being disconnected from the match.

I received many bans from disconnecting at that stage and I probably ruined around 20 matches creating unbalanced teams LOL. Anyways I am slightly disappointed in all that has happened because I was a victim of the xbox launch and I was hoping that this game would get a fresh start on the PC. I will enjoy some campaign for now and I hope that what I’ve gathered here has saved at least one person some time.