According to [url=http://games.slashdot.org/story/12/12/07/2250252/gamespys-new-owners-begin-disabling-multiplayer-without-warning?utm_source=slashdot&utm_medium=twitter]this article[/url], GameSpy (the server provider for Halo PC and Halo PC : CE) has shut down many servers. At the moment, this appears to include the servers for Halo on the PC. While this is not official, this appears to be the case. Further discussion on the topic can be found [url=http://forum.halomaps.org/index.cfm?page=topic&topicID=42025]here[/url].
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Interestingly, Ghost Recon and Rainbow Six: Rogue Spear are no longer supported by the original master server list hosts, but you can find games through Xfire still. [quote][b]Posted by:[/b] Btcc22 They rely on GameSpy.[/quote]