Causes of Elevated CPU Utilization with TAPI 2.0 and RAS

 Last reviewed: February 23, 1998
Article ID: Q181490
The information in this article applies to:
  • Microsoft Windows NT Workstation version 4.0
  • Microsoft Windows NT Server version 4.0
  • Microsoft Windows NT Server Enterprise Edition version 4.0
  • Microsoft Routing and Remote Access Service Update for Windows NT Server 4.0

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  • Your serial device or modem uses an outdated driver.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: Q131303

          TITLE     : Latest 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  • Update outdated serial device or modem drivers.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.

    

MORE INFORMATION

 


This information does not apply to TAPI 2.1.



	
	

	















	






Additional query words: 4.00 ntsee serial rras

Keywords          : NTRAS NTSrvWkst kbenv

Version           : WinNT:4.0

Platform          : winnt








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	Last reviewed:  February 23, 1998
	

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