Windows authentication with ServerSPN

[dikiydinozavrik]

I'm tryin to connect to the mssql server using kerberos auth from my linux host under the domain user
The connection string: "server=dc4.test.local;user id=;password=;ServerSPN=MSSQLSvc/dc4.test.local:1433"
But I get the following error: "Error connecting to the database: mssql: login error: Login failed for user ''."
Please give the example of correct connection string for Windows auth with SPN

I have tested connection from this host with sqlcmd and it was ok