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Diablo 2 Technical Support
http://www.blizzard.com/support/index.asp?Game=Diablo2
Official Blizzard technical support information containing FAQs and search facility.
Diablo II Networking Site
http://www.idleminds.org/~dirk/lan/
Information on setting up a LAN. FAQs, how to play behind a proxy server, and TCP/IP troubleshooting.
Diabloii.net - Technical Support
http://www.diabloii.net/generalinf/technical.shtml
User posted solutions to problems.
Open Tech Support Forums - Diablo II
http://www.opentechsupport.net/forums/forumdisplay.php?forumid=49
Provides a moderated technical support forum with FAQ's and searchable post archives.