I had a strange issue updating the Entity Framework model against a newly built SQL Server 2014 database. For some reason, it was talking a REALLY long time, even hours to connect. Using SQL Server Profiler, we saw some activity which never completed. I couldn’t figure it out until someone helped me by sending me this link: https://entityframework.codeplex.com/workitem/2445
Other users had indicated that Cumulative Update 5 needed to be installed and so this contained the resolution to the issue. If you don’t want to install Cumulative Updates, changing the compatibility level to SQL Server 2012 worked just fine as well. Changing the compatibility level immediately takes effect without server level restarts.