I imagine you are using the dbConnect app. There is a step by step in the documentation here.
A couple of notes regarding SQL Server. First, in the hostname field, you want to use an FQDN, a short name, or an IP Address. Don't use /.
In the database field, if you are using a named instance, the database field should be <instance>/<database>, otherwise, you'll want to verify the port that the instance is running on. I can't link to an external site, but if you google for "How to configure SQL Server to listen on a specific port", you'll get a link to knowledge base entry 823938 at microsoft, which has instructions for verifying the port that a given instance is running on.
