Accessing a service from Desktop App

If I remove the service from Biz.Sphinx then I can't access it through the url that is used to access Sphinx.

If I add another XData server to the server app with a different URL then I can access the service, but then I get

Project GASphinx.exe raised exception class EXDataMissingConnection with message 'Database connection not avaiable. Check if the connection pool is properly configured.'.

Then records I am adding/updating are in the Biz.Sphinx model (extended user class and an organisation/company class).