As of February 15th 2013, there will be no further official online support
from 343 Industries.
"To switch gears ever so slightly, we’re sad to report that the service
end-date for Halo 2 PC Multiplayer will be February 15, 2013. We’ve been
monitoring the population for months, and it’s been peaking consistently at
approximately 20 players or less. Those that own this game can continue to
enjoy Multiplayer over LAN after that date; however our network services will be
turned off at that time. We love you, Halo 2 PC, and you will live forever in