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:
256986 Description of the Microsoft Windows Registry
When you run a program over a Remote Access Service (RAS) connection, youmay encounter one of the following symptoms:
You are able to download data normally but you are not always able to upload data successfully.
Your Internet mail or news reading programs may time out or stopresponding (hang) when you attempt to send new messages.
This behavior can occur because Windows NT RAS uses a fixed size MaximumTransmission 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:
152734 How to Obtain the Latest Windows NT 4.0 Service Pack
NOTE: 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.
This hotfix also includes the fix referred to in the following articlein the Microsoft Knowledge Base:
163251 STOP 0xA Due to Buffer Overflow in Ndiswan.sys
There are two new registry keys to address this issue, one that allowsyou to edit the MTU for a RAS connection and another that allows you toedit the MTU for a Point-to-Point Tunneling Protocol (PPTP) connection. To edit the registry:
Start Registry Editor (Regedt32.exe or Regedit.exe) and locate thefollowing registry key: