Microsoft has just updated the following KB Article:
Restore fails when the site database uses SQL Server 2014 on a server that is running System Center 2012 Configuration Manager
Symptoms:
The Microsoft System Center 2012 R2 Configuration Manager Setup Wizard fails when you try to restore a database on a site that has Microsoft SQL Server 2014 installed. Additionally, you receive the following error message:
The SQL Server MYSQLSERVER.mydomain.com is not accessible or its version not supported.
Note This message is also logged in the Configuration Manager Setup log.
This issue also occurs when you use System Center 2012 Configuration Manager Service Pack 1 (SP1).
Full details at:
https://support.microsoft.com/en-gb/kb/3020755