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"My server rarely encounters the Door Boss, but many of you have to deal with the above error on a constant basis.  The error originated as a fix for high population realms that had issues with instance lag and crashes.  Rather than have you frustrated with problems while in the dungeon, Blizzard decided to put a virtual bouncer at the \"door\" to keep the load down on the instance servers.  While I do think that this was a good idea on Blizzard's part, I think that they erred greatly by not putting a queue at the \"entrance\" so that you can do other things while you wait -- much like the way Battlegrounds are handled.My friend Joe has to deal with the problem with on his realm and therefore made sure to ask his designated Blizzard representative when he attended the Laguna Art Museum benefit dinner.  Producer Carlos Guerrero replied that they needed to upgrade the hardware on the affected realms in order to allow more instances to be launched at the same time.  Presumably, that is what the extremely extended downtime was for on Tuesday.  So my question to you is, did it work?  Are you meeting the Door Boss with the same regularity, or are you able to enter instances more frequently now that your realm has been upgraded?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.engadget.com/2009/09/02/breakfast-topic-the-trouble-with-instance-servers/>