Article ID: 323352 - View products that this article applies to.
This article was previously published under Q323352
This step-by-step article discusses how to determine which program uses or blocks specific Transmission Control Protocol (TCP) ports.
The Netstat.exe utility has a new switch, the -o switch, that can display the process identifier (ID) that is associated with each connection. This information can be used to determine which process (program) listens on a particular port. For example, the netstat -ano command can produce the following output:
If you use Task Manager, you can match the process ID that is listed to a process name (program). With this feature, you can find the specific port that a program currently uses. Because a program already uses this specific port, another program is prevented from using that same port.
Proto Local Address Foreign Address State PID TCP 0.0.0.0:80 0.0.0.0:0 Listening 888
Article ID: 323352 - Last Review: December 3, 2007 - Revision: 6.4
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