RRAS Logs Event ID 20050 When PPTP Connection Is Refused

ID: Q233048

The information in this article applies to:

SYMPTOMS

Your Windows NT RRAS Server computer running the Point to Point Tunneling Protocol (PPTP) intermittently refuses client connections over a Remote Access Service (RRAS) connection. The following error message is logged in the Event log on the PPTP server:

Event ID: 20050 Source: Remote Access Description: The user Domain\User connected to port VPNx has been disconnected because the computer could not be projected onto the network.


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
   -----------------------------------------------------
   05/19/99   07:05p    60,048   Ndiswan.sys   x86
   05/19/99   07:03p   108,336   Ndiswan.sys   Alpha

   05/19/99   07:04p    60,432   Ndiswand.sys   x86
   05/19/99   07:03p   108,944   Ndiswand.sys   Alpha
NOTE: Ndiswan.sys is the 40-bit version and Ndiswand.sys is the 128-bit version of this file. If you are using 128-bit encryption, you need to install Ndiswand.sys and rename it to Ndiswan.sys to retain your encryption.

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.


MORE INFORMATION

This error is a result of projecting or "plumbing" the new route into the route table on the RRAS server for the connecting client. This only occurs when all the existing addresses have been used at least once and the clients connecting are actually recycling older, previously-used IP addresses.

Additional query words: projection 


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

Last Reviewed: July 6, 1999