Error - IDS_RDBMS_MISSING_HOST (ADM-10008)?

Whenever I try to create a connection to a SQL Server database I get the following error -

Connection Error: com.bobj.mm.sdk.SDKException: IDS_RDBMS_MISSING_HOST (ADM-10008)

I can connect to Oracle no problem. I'm sure this is something obvious but I'm new to the game, so if someone could point out the obvious, I'd appreciate it.

thanks