moved to the Server Admin area where Tabjolt resources are found and shared. 

1. Yes. You need the port. You must always specify hostURI otherwise TabJolt won't know where to send load. setting name/password is optional ONLY if you've also set it inside the userpool.csv file already. I typically always stick a username and password value in here, even if I have the same values in the userpool.csv file. It reduces the chance for error.

2. This is correct, although you seem to be running TabJolt on the same machine as Tableau itself? This is not a best practice as running the load testing tool ON the server will impact your results. Per the docs, you should run TabJolt on a different box

3. OK.

You probably have "fat fingered" one of the config settings. Please attach the ServerTestConfig file.

You need to keep the exact (original) formatting in the file. I see this:

    users:

        - !!com.tableausoftware.test.server.configuration.User         

          name:Group         password:

Group}

It should be this:

    users:

        - !!com.tableausoftware.test.server.configuration.User

          name: Group

          password: Group

}

Make sure to put a single space between name: and the username and password: and the password.