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This article describes a new feature that is available in the Microsoft Windows 2000 version of the netstat command. The netstat command can now display process IDs (PIDS) that are associated with active TCP or UDP network connections. This feature is available by downloading a Windows 2000 update.
A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem.
If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, submit a request to Microsoft Customer Service and Support to obtain the hotfix.
Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site:
Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.
No prerequisites are required.
You must restart the computer after you apply this update.
Update replacement information
This update does not replace any other updates.
The English version of this update has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.
Date Time Version Size File name--------------------------------------------------------------29-Sep-2005 05:24 5.0.2195.7071 67,856 Iphlpapi.dll 29-Sep-2005 05:05 5.0.2195.7071 27,920 Netstat.exe 23-Sep-2005 04:10 5.0.2195.7070 6,386,688 Sp3res.dll 29-Sep-2005 05:06 5.0.2195.7071 320,336 Tcpip.sys
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
The netstat command can display the following information:
Active TCP connections
Ports on which a computer is listening
The IP routing table
The netstat command displays active TCP connections when you use the command without parameters. The new -o parameter lets you audit and troubleshoot the ports that are being used. When you use the netstat command together with the -o parameter, the command displays the owning PID that is associated with each connection.This parameter was not previously present in Windows 2000. After you install this update, you can map ports to PIDs by using the netstat -ano command.
Note The Microsoft Windows XP and Microsoft Windows Server 2003 versions of the netstat command can display PIDs. This update does not provide the -b and -v parameters that are available in the Windows XP and Windows Server 2003 versions of the netstat command.
The netstat -ano command displays output that is similar to the following:
You can identify the port and the associated PID from the netstat -ano command output. You can then use Task Manager to identify the process that is associated with the PID. By default, Task Manager does not display the PID that is associated with a process. To display a PID in Task Manager, follow these steps:
Press CTRL+ALT+DELETE, and then click Task Manager.
In Task Manager, click the Process tab, click View, and then click Select Columns.
In the Select Columns dialog box, click to select the PID (Process Identifier) check box, and then click OK. You see that the PID column has been added to the Process tab. You can now locate the PID and the corresponding executable file that started the process in Task Manager.
For more information about how to use the netstat command to find a PID, click the following article number to view the article in the Microsoft Knowledge Base:
281336 How to determine which program uses or blocks specific transmission control protocol ports in Windows
For more information about standard terminology that is used to describe Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates