Its cOLD mOLD at this point, but just in case anyone missed this:
Sauce: https://www.halowaypoint.com/en-us/news/cetacean-celebration
Some fans pointed out a few weeks ago that the Halo 2 Vista servers were no longer showing up in-game. Yes, people still play Halo 2 Vista. Who knew!? (seriously, I didn’t really, but the team obviously does). It turns out that Halo 2 Vista servers are somewhat of an enigma. The 343 team is currently investigating the situation (we/343 don't actually manage these servers ourselves).
Sauce: https://www.halowaypoint.com/en-us/news/cetacean-celebration