Management Reporter 2012 on GP 2015 Couldn't retrieve the list of available databases: The connection attempt failed.

While trying to configure Management Reporter 2012 on a brand new install of GP 2015 I received the following error:

“Couldn’t retrieve the list of available databases: The connection attempt failed.”

Configuration is SQL 2012 on Server 2012 R2, GP 2015 on Server 2012 R2.

Solution: Install Dexterity Shared Components 12 from the install disc for GP2013 R2.

I found the answer here:
https://community.dynamics.com/gp/f/32/t/146554.aspx

Thank you to Richard Markham.