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When troubleshooting TCP/IP connectivity
problems on a Windows XP system, you may want to find out what
applications or services are listening on which open TCP and UDP
ports. To make this task easier, Microsoft beefed up the Netstat
command-line tool in Service Pack 2 with a new parameter.

The new -b parameter builds onto the
information displayed by the -o parameter. The -b parameter allows
the Netstat command to display the TCP or UDP port, the file names
corresponding to the components of the service that owns the port,
and the PID.

Then, you can use the Tasklist /SVC command to
display the list of each service in each process. Now, cross
reference the file name and the PID obtained from the Netstat -b
command with the list generated by the Tasklist /SVC command to
identify which services are currently using what ports.

For more information on SP2, visit
TechRepublic’s Windows XP Service Pack 2 Spotlight page, which
contains news stories, downloads, discussions, articles, white
papers, and more.