No, I'm wrong. It didn't go any further. I put in a double '=' sign in there, and it just took longer to process.

This one at least tells me the service credentials don't belong there, I guess because it's being interpreted as an ordinary user which conflicts with Windows Authentication.

Code:
ConnectionString_s = "Provider=SQLNCLI11 ; Data Source=SSSSSSSSSSSSS.svc.st.gov\IIIIIIIIII,99999;database=DDDDDDDDDDD;Integrated Security = SSPI;User ID=SVC\SASASASASASASASASA;Password=PPPPPPPPPPPPPPPPPPPPPPPPP"
Returns
"Login failed for user 'SVC\Dddddd2' (Ddddd2 is my identity on the PC where I'm running the VBScript)."

So, I still don't understand - and can't find on the web - how to log into Sql Server with a Service Account. I have no problem logging in, any other way.