You cannot prevent the use of the NetMessageBufferSend function in Windows Messenger

You cannot configure the Windows Messenger service to prevent the use of the NetMessageBufferSend function on any computer except on the computer that is sending the message.

Service pack information

To resolve this problem, obtain the latest service pack for Microsoft Windows XP. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

Part 1. Obtain and then install the hotfix

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. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

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, contact 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. The English version of this hotfix has the file attributes (or later) 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.

Part 2. Add the registry key and the registry value to the registry

Warning If you use Registry Editor incorrectly, you may cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that you can solve problems that result from using Registry Editor incorrectly. Use Registry Editor at your own risk.

Follow these steps, and then quit Registry Editor:

1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following key in the registry:
   System\CurrentControlSet\Services\LanmanWorkstation\Parameters
3. On the Edit menu, point to New, and then click DWORD Value.
4. Type LimitMessageSend, and then press ENTER.
5. On the Edit menu, click Modify.
6. Type 0, and then click OK.

Note The LimitMessageSend value of 0 is the default setting. You may also enter 1 for no regular users, or enter 2 if you want only the administrator to be able to send messages.

One workaround for this problem is to prevent the Messenger service from running. For additional information about how to prevent Windows Messenger from running, click the following article number to view the article in the Microsoft Knowledge Base:

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Windows XP Service Pack 2.

For additional information, click the following article number to view the article in the Microsoft Knowledge Base: