Connection to SQL Server Express 2014 - Impossible to connect

Hello,

I try to use SQL Developer 4.1 (JDBC 1.3.1) to conncet SQL Server Express 2014.

I use hostname=localhost and port = 1433/OAE;instance=SQLEXPRESS (OAE is my DB)

My error message is in french, but I think is "Test failure - Impossible to connect to server Microsoft SQL Server on localhost"

The TCP/IP protocol for SS is enable; I use Windows authentication.

Thanks for the help.