MSSQL 2005 Connection Problems

[Mugs321]

Hi there,

I'm trying to use an asp-based database GUI (a-la PHPMyAdmin) and I'm having problems connecting to my production MSSQL 2005 database. I connected successfully to my SQLExpress server using the very same connection string. This is the error:

Error: [DBNETLIB][ConnectionOpen (Invalid Instance()).]Invalid connection. 
Error: Provider=SQLOLEDB;Data Source=;User Id=;Password=;Initial Catalog=HRC_Mentoring_Dev; 
 

The Server, User Id and Password have been removed for the purposes of this post. Any thoughts?