After you install Service Pack 3 for Windows NT 4.0 Server, clients who try to log on using the IPX protocol may experience problems.

Microsoft Network Clients version 3.0 for MS-DOS may display the following error: Windows for Workgroups and Windows 95 clients may report password problems. They may display the following error message: MS-DOS clients and Windows for Workgroups clients may fail every time. Windows 95 clients may only fail sporadically. NT clients will not experience a problem because they do not use Direct Hosting to establish a session.

The Microsoft network clients 3.0 for MS-DOS may also exhibit problems Establishing a session to a member server in the logon domain. In this case, you may receive the following error:

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To resolve this problem, obtain the latest service pack for Windows NT 4.0 or Windows NT Server 4.0, Terminal Server Edition. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

To work around this problem, follow the steps below.

WARNING: Using Registry Editor incorrectly can cause serious problems that may require you to reinstall your operating system. Microsoft cannot guarantee that problems resulting from the incorrect use of Registry Editor can be solved. Use Registry Editor at your own risk.

For information about how to edit the registry, view the "Changing Keys And Values" online Help topic in Registry Editor (Regedit.exe) or the "Add and Delete Information in the Registry" and "Edit Registry Data" online Help topics in Regedt32.exe. Note that you should back up the registry before you edit it.

1.	Use the Regedt32.exe tool, and navigate to the following location: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanManServer \Parameters NOTE: The above registry key is one path; it has been wrapped for readability.
2.	Add the following value: Value Name: MinClientBufferSize Data Type: REG_DWORD Radix: Hex Data: 1F4
3.	Rebooted the computer to have this change take effect.

To resolve domain validation errors, either the hotfix or the registry change should be applied to all domain controllers running the IPX protocol.

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Microsoft has confirmed that this is a problem in Windows NT 4.0 and Windows NT Server 4.0, Terminal Server Edition. This problem was first corrected in Windows NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition Service Pack 4.

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