Microsoft KB Archive/265152

= BUG: RasDial Function Gets Slower with Large Number of Redials =

Article ID: 265152

Article Last Modified on 2/28/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows NT Server 4.0 Standard Edition
 * Microsoft Windows NT Workstation 4.0 Developer Edition

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This article was previously published under Q265152



IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry



SYMPTOMS
If the RasDial function is used to make a large number of repetitive dials, performance begins to slow down after thousands of cycles. This problem occurs only when you are dialing numbers that do not use a phone-book entry.



CAUSE
Windows NT 4.0 and Windows 2000 use the registry to cache information for each successful RasDial attempt. After several thousand cycles, the registry grows very large and performance degrades as the operating system searches to the end of the registry hive.



RESOLUTION
You can work around this problem by disabling password caching.

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.

To disable the password-caching feature for Remote Access Service (RAS), perform the following steps:  Start Registry Editor (Regedt32.exe), and then select the following subkey:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\Parameters

 On the Edit menu, click Add Value, and then type the following information:

Value Name: DisableSavePassword

Value Type: REG_DWORD

Value Data: 1





STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.



Steps to Reproduce Behavior
To reproduce this behavior, obtain the RasDial sample from the Microsoft Platform SDK and call it repetitively from a batch file, using command-line arguments for the user, password, domain, and telephone number. After several hours, notice that each connection takes longer and longer.

Keywords: kbbug kbpending KB265152

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