Possible Causes of Elevated CPU Utilization with TAPI 2.0 and RAS
Article ID: 181490
Article Last Modified on 10/31/2006
APPLIES TO
- Microsoft Windows NT Workstation 4.0 Developer Edition
- Microsoft Windows NT Server 4.0 Standard Edition
- Microsoft Windows NT Server 4.0 Enterprise Edition
This article was previously published under Q181490
SYMPTOMS
Tapisrv.exe may begin to use an excessive amount of processor time (from
50% to 100%) with Remote Access Services (RAS) installed.
CAUSE
This problem may occur if you use TAPI 2.0 and any of the following are
true:
- RAS is configured with modems that are no longer connected to the system
or that are powered off.
- Your serial device or modem uses an outdated driver.
- You are using a multi-port device that does not appear on the Microsoft
Windows NT 4.0 Hardware Compatibility List. For more information on the
Windows NT Hardware Compatibility List, please see the following article
in the Microsoft Knowledge Base:
ARTICLE-ID: 131303
TITLE : Latest Windows 2000 and Windows NT Hardware Compatibility List (HCL)
RESOLUTION
To resolve this problem, perform one of the following:
- Remove any modems listed in the RAS Server configuration that are no
longer on the system.
- Connect the modems listed in the RAS Server configuration.
- Turn on all modems connected to the system.
- Update outdated serial device or modem drivers.
- Make sure your serial device or modem is on the Hardware Compatibility
List.
- Update the firmware for your serial device or modem.
Additional query words: ntsee serial rras
Keywords: kbenv KB181490