Millions of blogs hosted by LiveJournal and TypePad were unavailable throughout Tuesday night and into Wednesday morning as a massive denial-of-service attack struck their servers.

The attack that brought down the servers at Six Apart — the San Francisco company behind the LiveJournal and TypePad services, and the Moveable Type blogging software — began at 4 p.m. PDT Tuesday, according to an advisory posted to the firm’s Web site by Michael Sippey, the vice president of product.“Six Apart has been the victim of a sophisticated distributed denial of service attack,” said Sippey. “This has affected all of Six Apart’s sites, causing intermittent and limited availability for TypePad, LiveJournal, TypeKey, sixapart.com, movabletype.org and movabletype.com.”

I trust you were not affected by this…it’s a frightening thing and unfortunately is happening all to often as it appears that some people get their kicks from it!