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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:
(https://support.microsoft.com/kb/256986/EN-US/ )Description of the Microsoft Windows Registry
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.
The result of running out of buffer space in the NetBT datagram buffer may be one cause of this error.
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.
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.