Access Violation in RRAS When Windows Time Service Adjusts System Time

ID: Q222077

The information in this article applies to:

Microsoft Windows NT Server version 4.0

SYMPTOMS

On a system with Routing and Remote Access Service (RRAS), the following symptoms may occur as a result of a negative system time adjustment.

Mpradmin.exe may display an Integer Overflow exception error message (status code 0xC0000095).

You may not be able to stop Mprouter.exe and it stops accepting new RRAS connections.

CAUSE

Both symptoms are caused by an arithmetic calculation for call duration that can generate a negative 64-bit result that causes an integer overflow when saved in a 32-bit integer format. This behavior occurs only if the time adjustment is negative and sufficiently large enough to move the system clock back to a time prior to the beginning of any RRAS connection.

Time adjustments are caused in a variety of ways. Manual time correction through the System Time tool in Control Panel is a potential source, as are automatic mechanisms such as the intrinisic OS operations that periodically synchronize the system time to the CMOS clock resource. Domain-based Microsoft network time services can similarly cause this problem. Additionally, third-party programs that synchronize the system clock to a network-accessible reference clock can act to stimulate this problem.

RESOLUTION

A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to systems experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows NT 4.0 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:

http://www.microsoft.com/support/supportnet/overview/overview.asp

The English version of this fix should have the following file attributes or later:


   Date      Time     Size     File name    Platform
   --------------------------------------------------
   03/01/99  09:31p   62,224   Mprddm.dll    x86
   05/10/99  03:39p   60,176   Rasppen.dll   x86

   03/01/99  09:30p   100,112   Mprddm.dll    Alpha
   05/10/99  03:38p    98,576   Rasppen.dll   Alpha

NOTE: If this product was already installed on your computer when you purchased it from the Original Equipment Manufacturer (OEM) and you need this fix, please call the Pay Per Incident number listed on the above Web site. If you contact Microsoft to obtain this fix, and if it is determined that you only require the fix you requested, no fee will be charged. However, if you request additional technical support, and if your no-charge technical support period has expired, or if you are not eligible for standard no-charge technical support, you may be charged a non-refundable fee.

For more information about eligibility for no-charge technical support, see the following article in the Microsoft Knowledge Base:

Q154871 Determining If You Are Eligible for No-Charge Technical Support

STATUS

Microsoft has confirmed this to be a problem in Windows NT 4.0.

Additional query words: 4.00


Keywords          : kbbug4.00 kbfix4.00 
Version           : winnt:4.0
Platform          : winnt 
Issue type        : kbbug

Last Reviewed: July 2, 1999