Connecting to Mssqllocaldb

I cannot connect DataGrip to a running instance of MsSqlLocalDb. I tried following the instructions at https://blog.jetbrains.com/datagrip/2016/10/07/connecting-datagrip-to-sql-server-express-localdb/, but still could not connect.

I tried using the jTds, but it does not appear to support accessing localdb via Windows account authentication (I have no user/passwords set up on localdb).

I also tried using the Sql Server (Microsoft) option, which claims to support Windows domain authentication, but when I do Test Connection it fails with the message the connection was refused (this is using URL only, whatever that means).

How do I get DataGrip working with mssqllocaldb?

- Mark