When you use the Performance Monitor to monitor Network Interface object counters with Windows Telephony service turned off, the Microsoft Management Console (Mmc.exe) will experience a memory leak every time the Rasctrs.dll file is loaded and unloaded in memory. A system event log entry that is similar to the following is generated every time the Rasctrs.dll is loaded:
This problem occurs if Windows Telephony service is turned off.
Hotfix informationA 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.
PrerequisitesYou must have Windows 2000 Service Pack 3 (SP3) or Windows 2000 Service Pack 4 (SP4) installed before you apply this hotfix.
Restart requirementYou must restart your computer after you apply this hotfix.
Hotfix replacement informationThis hotfix does not replace any other hotfixes.
File informationThe 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.
Date Time Version Size File name
09-Oct-2003 00:18 5.0.2195.6864 13,072 Rasctrs.dll
To work around this problem, do not turn off the Windows Telephony service.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section of this article.
For additional information about how hotfix packages are named, click the following article number to view the article in the Microsoft Knowledge Base:
816915 New Naming Schema for Microsoft Windows Hotfix PackagesFor additional information, 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
Article ID: 830459 - Last Review: Feb 15, 2017 - Revision: 2