The context of this question was unclear. This is a DBA forum and per Microsoft, the default dedicated Administrative port for SQL Server is 1434, which is always available if the main SQL Server service is running. Port 1433 is the default port for user connection and it is possible for the service to be running but port 1433 to be unavailable. It seems to me that both 1433 and 1434 should be deemed correct answers to this question.