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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Excuse me but no, Halo PC's servers are not down. Halo Trial's is blocked but Halo PC/Custom Edition are running as they always have been.