The only connection problems you can face is if the folowing are wrongly made.
1: ODBC
(Id first try make this cnnection, as its the easiest. reqires no sql dll, just ODBC connected via Windows NT authority (not via sql connection info)
See if that works. if it does, then you are ready to upgrade to the propper way.
2: Gregoos SQL dll:
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Ener your SQL info there. then edit the dll like shown here:
http://forum.ragezone.com/f286/lost-connection-server-945717/#post7700245
Rememebr to fix up your registrastion script.
Replace the disuseday date with a year FAR i the future or only the defualt admin admin password will be able to logn chars.
You will be connected in no time.