Microsoft KB Archive/323352

= How To Determine Which Program Uses or Blocks Specific Transmission Control Protocol Ports in Windows Server 2003 =

Article ID: 323352

Article Last Modified on 12/3/2007

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APPLIES TO


 * Microsoft Windows Server 2003, Standard Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise Edition (32-bit x86)
 * Microsoft Windows Server 2003, Enterprise x64 Edition
 * Microsoft Windows Server 2003, Datacenter Edition (32-bit x86)
 * Microsoft Windows Server 2003, 64-Bit Datacenter Edition
 * Microsoft Windows Server 2003, Web Edition
 * Microsoft Windows Small Business Server 2003 Standard Edition
 * Microsoft Windows Small Business Server 2003 Premium Edition

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This article was previously published under Q323352



For a Microsoft Windows XP version of this article, see 281336.

IN THIS TASK
SUMMARY
 * How to Match the Process ID to a Program
 * How to Obtain Additional Information About the Netstat.exe Utility



SUMMARY
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: Proto   Local Address    Foreign Address    State        PID TCP     0.0.0.0:80       0.0.0.0:0          Listening    888 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.

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How to Match the Process ID to a Program
To match the process ID to a program, follow these steps:
 * 1) Press CTRL+ALT+DELETE, and then click Task Manager.
 * 2) Click the Processes tab.
 * 3) If you do not have a PID column, click View, click Select Columns, and then click to select the PID (Process Identifier) check box.
 * 4) Click the column header that is labeled &quot;PID&quot; to sort the process by PIDs. You should be able to easily find the process ID and match it to the program that is listed in Task Manager.

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How to Obtain Additional Information About the Netstat.exe Utility
To obtain additional information about the Netstat.exe utility, follow these steps:
 * 1) Click Start, and then click Run.
 * 2) In the Open box, type cmd, and then click OK.
 * 3) At a command prompt, type netstat /?.

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Additional query words: kbappsvc

Keywords: kbhowtomaster kbnetwork KB323352

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