Article ID: 183229 - View products that this article applies to.
This article was previously published under Q183229
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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:
(http://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
When you run a program over a Remote Access Service (RAS) connection, you may encounter one of the following symptoms:
This behavior can occur because Windows NT RAS uses a fixed size Maximum Transmission Unit (MTU) of 1500.
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 resolve this problem, obtain the latest service pack for Windows NT version 4.0. For additional information, click the article number below to view the article in the Microsoft Knowledge Base:
152734NOTE: Your computer must run Windows NT 4.0 Service Pack 3 before you apply this fix. This hotfix can also be applied to the Routing and Remote Access Service Upgrade.
(http://support.microsoft.com/kb/152734/EN-US/ )How to Obtain the Latest Windows NT 4.0 Service Pack
This hotfix also includes the fix referred to in the following article in the Microsoft Knowledge Base:
163251There are two new registry keys to address this issue, one that allows you to edit the MTU for a RAS connection and another that allows you to edit the MTU for a Point-to-Point Tunneling Protocol (PPTP) connection. To edit the registry:
(http://support.microsoft.com/kb/163251/EN-US/ )STOP 0xA Due to Buffer Overflow in Ndiswan.sys
Microsoft has confirmed this to be a problem in Windows NT version 4.0. This problem was first corrected in Windows NT 4.0 Service Pack 4.
Using the EnablePMTUDiscovery and/or EnablePMTUBHDetect registry values will have no effect because the TCP/IP MTU for a RAS connection is a fixed value.
For additional information on TCP/IP, please see the following white paper available on the Microsoft ftp server:
File Name: Tcpipimp2.doc
Title: "Microsoft Windows NT 3.5/3.51/4.0: TCP/IP Implementation Details TCP/IP Protocol Stack and Services, Version 2.0"
Article ID: 183229 - Last Review: February 21, 2014 - Revision: 1.1