Microsoft KB Archive/883516

= You receive Stop error 0x19 or Stop error 0x50 in the Tcpip.sys file on a Windows 2000 Server-based computer =

Article ID: 883516

Article Last Modified on 10/26/2006

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APPLIES TO


 * Microsoft Windows 2000 Server

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SYMPTOMS
You receive Stop error 0x19 or Stop error 0x50 on a blue screen. The error occurs in the Tcpip.sys file on a Microsoft Windows 2000 Server-based computer. The error may occur more frequently on computers that are running Microsoft Exchange Server.



CAUSE
This problem occurs because the TCP/IP stack tries to free a buffer that the stack did not allocate. In this scenario, the data pool header is corrupted, and the computer stops unexpectedly. This error occurs only if you use Internet Protocol security (IPsec) in your network environment.



Hotfix information
A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites
You must be running Windows 2000 Server Service Pack 3 to apply this hotfix.

Restart requirement
You must restart your computer after you apply this hotfix.

Hotfix replacement information
This hotfix does not replace any other hotfixes.

File information
The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time   Version            Size    File name --  19-Jun-2003  20:05  5.0.2195.6687     120,240  Afd.sys 19-Jun-2003 20:05  5.0.2195.6602     108,816  Msafd.dll 07-Oct-2004 08:29  5.0.2195.6983     318,928  Tcpip.sys 19-Jun-2003 20:05  5.0.2195.6655      16,240  Tdi.sys 19-Jun-2003 20:05  5.0.2195.6601      17,680  Wshtcpip.dll



WORKAROUND
Important These steps may increase your security risk. These steps may also make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We recommend the process that this article describes to enable programs to operate as they are designed to, or to implement specific program capabilities. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this process in your particular environment. If you choose to implement this process, take any appropriate additional steps to help protect your system. We recommend that you use this process only if you really require this process.

To work around this problem until you can apply this hotfix, temporarily turn off IPsec in your network environment. To do this, follow these steps:
 * 1) Click Start, point to Settings, and then click Network and Dial-up Connections.
 * 2) Right-click your local area connection, and then click Properties.
 * 3) Double-click the Internet Protocol (TCP/IP) component, click Advanced, and then click the Options tab.
 * 4) Click IP security, and then click Properties.
 * 5) Click Do not use IPSEC, and then click OK four times to close the local area connection properties.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.



MORE INFORMATION
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

824684 Description of the standard terminology that is used to describe Microsoft software updates

Additional query words: bug check bugcheck

Keywords: kbwin2000sp5fix kbwin2000presp5fix kbbug kbserver kberrmsg kbnetwork kbsecurity kbfix kbhotfixserver kbqfe KB883516

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