Normally, you just set the SQL database host name like this. If you have defined database instances, you may need to append that (like JUPITER\InstanceName)
It looks like your database settings are incorrect. What did you specify?
Hi Andrej,
1. installed SQL server, created an empty database, 'defaulttest''
2. Created one user ''mendixuser'' in the new database in SQL.
3. Opened mendix modeler, in configuration mentioned below settings and ran locally.
The above is true. You don't need a "URL" just the machine name\Instancename as long as it is local or on the network.