There are two virtual machines:
One where I've created an enterprise geodatabase on a Microsft SQL 2014 server- with a Windows Server 2012 R2 64-bit Operating system
And a second machine where ArcGIS Server 10.3 and ArcGIS Desktop 10.3 are installed + Microsoft SQl Server 2012 Native Client 64-bit SP1. This machine has a Windows Server 2012 R2 64-bit Operating system, as well.
I'm trying to publish a map service on the server with data from the enterprise gdb. When trying to register my geodatabase with the server, I get the following error:
" The connection property set was missing a required property or the property values was unrecognized. Connection was attempted with an older version of SQL Server client communications software that is not compatible with the SQL Server database server"
So I've search for Microsoft SQl Server 2014 Native Client but couldn't find it. There is no SQL Server 2014 Native Client.
It's the same problem as this one: https://geonet.esri.com/thread/84553, but for me installing the 64 bit client didn't fix the problem.