I'm trying to enable a geodatabase with ArcGIS/ArcSDE 10.4 on a SQL Server 2008 R2 database. I get an error that says "The version of your database server is not supported
ERROR installing/upgrading ArcSDE, Error = -494"
My database is SQL Server 2008 R2 (SP2) 10.50.4000 Enterprise Edition (64-bit). I'm using the enable enterprise geodatabase tool which has always worked in the past. Although this is the first time I'm trying it with 10.4. Anyone come across this error or know how to fix it?