DOCUMENT:Q217023  11-JUN-2002  [winnt]
TITLE   :Event ID 5701 Starting Netlogon on Domain Controller
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 
 - Microsoft Windows NT Server, Enterprise Edition version 4.0 
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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:

   Q256986 Description of the Microsoft Windows Registry

SYMPTOMS
========

While starting the Netlogon service on a domain controller, the service fails
with an error 5701. There is also an event logged to the Event Log:

   Netlogon Event ID 5701:

   The Netlogon service failed to update the domain trust list. The following
   error occurred: There are currently no logon servers to validate the logon
   request.

CAUSE
=====

The result of running out of buffer space in the NetBT datagram buffer may be
one cause of this error.

RESOLUTION
==========

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 issue, increase MaxDgramBuffering from 128 KB to 256 KB.

1. Start Registry Editor (Regedt32.exe).

2. Locate the following key in the registry:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NetBT\Parameters

3. On the Edit menu, click Add Value, and then add the following registry value:

   Value Name: MaxDgramBuffering
   Data Type: REG_DWORD
   Value: 0x40000

4. Quit Registry Editor.

MORE INFORMATION
================

MaxDgramBuffering
-----------------

   Key: Netbt\Parameters
   Value Type: REG_DWORD - Count of bytes
   Valid Range: 0 - 0xFFFFFFFF
   Default: 0x20000 (128 KB)
   Description: This parameter specifies the maximum amount of memory that NetBT
   will dynamically allocate for all outstanding datagram sends. After this
   limit is reached, further sends will fail due to insufficient resources.

Additional query words: 5701

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Keywords          :  
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTSEntSearch kbWinNTSEnt400 kbWinNTS400search kbWinNTS400
Version           : winnt:4.0
Issue type        : kbprb

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