Spring Boot的SQL连接错误

I am getting this "SQL state [null]; error code [0]; The connection is closed.; nested exception is com.microsoft.sqlserver.jdbc.SQLServerException: The connection is closed." Error when using springBootVersion = '1.5.4.RELEASE', JDBC driver version 6, and SQLServer 2008R2, using database mirroring. My connection settings:I am getting this "SQL state [null]; error code