Hi ROEL BERGS,
there are news. Yesterday I did this in our server for the version NAV 2013 R2 and it works.
I suggest you to check the user that run the services.
After you managed the connection if you want you can create a Reg file for each version/build you installed ss that you can run objects directly from the Dev Env.
In my post there are details:
www.myerrorsandmysolutions.com/the-client-version-does-not-match-the-server-version