its in ur reg..

type regedit in ur run place
go to My Computer -> HKEY_CURRENT_USER -> Software -> Battle.net -> Configuration

in it should b a "Diablo II Battle.net gateways" key, make sure that the key is set to(just copy and paste):

1002
02
uswest.battle.net
8
U.S. West
useast.battle.net
6
U.S. East
asia.battle.net
-9
Asia
europe.battle.net
-1
Europe
localhost
-1
ClientConnect


and that should fix it, ur u can reinstall diablo II. but u dont have the cd

EDIT: i have a clientconnect for BNetHackit, for the colored text, and that isnt needed...