#3
Note : If you need using IIS , don't do this tip :

On Windows 2000, IIS 5 runs by default and is composed of SMTP, HTTP and IIS administration services. To close TCP ports 25, 80, 443, UDP port 3456, one port used by IIS administration website (4983 in our example) and two ports, higher than 1023 for RPC services, these services must be stopped.
The quickest way to stop these services is to stop the iisadmin service (other services depend on it):

C:\WINNT>net stop iisadmin
The following services are dependent on the IIS Admin Service service.
Stopping the IIS Admin Service service will also stop these services.