Run netstat -b to determine which programs are listening to which TCP/IP ports. For example, here's the output that I got when I ran netstat -b on my machine. Note: I've replaced the actual digits with X:
Active Connections Proto Local Address Foreign Address State PID TCP DIM3000:XXXX localhost:XXXX ESTABLISHED XXXX [firefox.exe] TCP DIM3000:XXXX localhost:XXXX ESTABLISHED XXXX [firefox.exe] TCP DIM3000:XXXX XXX.XXX.X.X:XXXX ESTABLISHED XXXX c:\windows\system32\WS2_32.dll C:\WINDOWS\System32\WINHTTP.dll [svchost.exe] TCP DIM3000:XXXX server2005.re-invent.com:ms-sql-s ESTABLISHED XXXX [devenv.exe] TCP DIM3000:XXXX XX.XX.XX.XX:http ESTABLISHED XXXX [firefox.exe] TCP DIM3000:XXXX server2005.re-invent.com:ms-sql-s TIME_WAIT 0
The Firefox browser (firefox.exe) was listening to three ports. Visual Studio 2005 (devenv.exe) was listening to one port.
netstat is useful for troubleshooting SQL Server connection pooling issues, plus it's useful for hunting down spyware on your machine.
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