Make sure you have defined the path to the database correctly.

If you used the automated install of SQL Express using TestCaddy's Configuration Wizard, this path would have been set by default. This should read "localhost\TestCaddy". The username is 'sa' and the password is 'TestCaddy1'.

Some SQL servers use an instance name, e.g. SQLExpress, so you specify the server as machine_name\instance_name , e.g. machine2\SQLExpress. Some SQL server have no instance name and so you just specify the machine name, e.g. machine2