If you are running under Windows NT or 2000. You can use the utilities provided by the company:

[list=1][*]Server Monitor[*]Task Manager[*]Performance Monitor[*]Network Monitor: This utility is for finding out what is happening around your server at the packet level of network transmission. It also monitors all the traffic to and from the server. Furthermore it can be set to filter information from a particular node or address.[/list=1]