1.1.1.1 breaks Xbox Live, Halo Master Chief Collection on PC

When 1.1.1.1 is used, some Xbox Live features work, but some don’t. In particular, attempting multiplayer on Halo Master Chief Collection for PC doesn’t appear to work; any time players try to join each other, they get “failed to connect” errors in-game. Additionally, features that require Xbox Live, such as rankings, don’t show-up in game.

Switching to 8.8.8.8 resolves the issue.

I haven’t had time to troubleshoot much, but I’m guessing it’s an ECS issue. I don’t know which domains it’s querying; the networking for Halo and Xbox Live is a mess, so I’ll need a good chunk of time to figure it out.