SqlClient: Microsoft.Data.SqlClient 2.0.0 A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: HTTP Provider, error: 0 - )

After a NuGet update of Microsoft.Data.SqlClient from 1.1.3 to 2.0.0 I am no longer able to connect to SQL Server 2017 14.0.3294.2 (latest update). I get an error: A connection was successfully established with the server, but then an error occurred during the pre-login handshake. (provider: HTTP Provider, error: 0 - )

Code:

using (var cnn = new SqlConnection(CreateConnectionString(server, port, LoginDatabaseName, Username, Password)))
            {
                var cmd = new SqlCommand("uspGetDatabasesByLogin", cnn);
                cmd.CommandType = CommandType.StoredProcedure;
                cmd.Parameters.Add(new SqlParameter("@LoginName", login));

                try
                {
                    cnn.Open();
                }
                catch (SqlException ex)
                {
                    //it goes here
                    greska = ex;
                    return ret;
                }
...