Probably some incomplete/faulty/missing entries in your registry.
If you are going to try this, before you start, make a backup of the registry of the paths you see below (so you can undo any changes which turn out to be less then desired. Start regedit.exe and rightclick a specfic part of the tree and choose export)
After you have ensured you can recreate the current situation, paste the following in a registry file (whateveritsname.reg) (Doubleclicking a reg file causes the reg file to be merged into your registry)
---------- paste from here ------------ Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Battle.net\Configuration] "Server List"="exodus.battle.net"
[HKEY_CURRENT_USER\Software\Battle.net\Configuration] "Diablo II Battle.net gateways"=hex(7):31,00,30,00,30,00,35,00,00,00,30,00,34,\ 00,00,00,75,00,73,00,77,00,65,00,73,00,74,00,2e,00,62,00,61,00,74,00,74,00,\ 6c,00,65,00,2e,00,6e,00,65,00,74,00,00,00,38,00,00,00,55,00,2e,00,53,00,2e,\ 00,20,00,57,00,65,00,73,00,74,00,00,00,75,00,73,00,65,00,61,00,73,00,74,00,\ 2e,00,62,00,61,00,74,00,74,00,6c,00,65,00,2e,00,6e,00,65,00,74,00,00,00,36,\ 00,00,00,55,00,2e,00,53,00,2e,00,20,00,45,00,61,00,73,00,74,00,00,00,61,00,\ 73,00,69,00,61,00,2e,00,62,00,61,00,74,00,74,00,6c,00,65,00,2e,00,6e,00,65,\ 00,74,00,00,00,2d,00,39,00,00,00,41,00,73,00,69,00,61,00,00,00,65,00,75,00,\ 72,00,6f,00,70,00,65,00,2e,00,62,00,61,00,74,00,74,00,6c,00,65,00,2e,00,6e,\ 00,65,00,74,00,00,00,2d,00,31,00,00,00,45,00,75,00,72,00,6f,00,70,00,65,00,\ 00,00,63,00,6c,00,61,00,73,00,73,00,69,00,63,00,62,00,65,00,74,00,61,00,2e,\ 00,62,00,61,00,74,00,74,00,6c,00,65,00,2e,00,6e,00,65,00,74,00,00,00,38,00,\ 00,00,43,00,6c,00,61,00,73,00,73,00,69,00,63,00,20,00,42,00,65,00,74,00,61,\ 00,00,00,00,00 "Server List"="exodus.battle.net" ---------- till here ------------
The first line of the lines to be pasted may be a bit different depending on windows version, but after you've made the backup, you should be able to see what line your windows creates (what version of regedit you're using). I think it's best to alter the first line to match the regedit version on your computer.
Not sure how this heap of text is going to look after I press submit, but the basic idea is to have a look at your registry, these paths :
[HKEY_CURRENT_USER\Software\Battle.net]
[HKEY_CURRENT_USER\Software\Blizzard Entertainment]
[HKEY_LOCAL_MACHINE\SOFTWARE\Battle.net]
[HKEY_LOCAL_MACHINE\SOFTWARE\Blizzard Entertainment]
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