PRB: Netlogon Logs Event ID 5719 on a Domain Controller

This article applies to Windows 2000. Support for Windows 2000 ends on July 13, 2010. The Windows 2000 End-of-Support Solution Center is a starting point for planning your migration strategy from Windows 2000. For more information see the Microsoft Support Lifecycle Policy.


When the Netlogon service starts or the service is under load, the following event may be logged to the Event Log:

Event Type:Error
Event Source:NETLOGON
Event Category:None
Event ID:5719
Time:4:12:55 PM
No Windows NT or Windows 2000 Domain Controller is available for domain <domain name>. The following error occurred:
There are currently no logon servers available to service the logon request.
0000: c000005e


One possible cause of this error is that you have run out of buffer space in the NetBT datagram buffer.


Important This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base:
322756 How to back up and restore the registry in Windows

To resolve this problem, increase the MaxDgramBuffering value from 128 KB to 256 KB:

  1. Start Registry Editor (Regedt32.exe).
  2. Locate the following key in the registry:
  3. On the Edit menu, click Add Value, and then add the following information:
    Value Name: MaxDgramBuffering
    Data Type: REG_DWORD
    Value: 0x40000
  4. Quit Registry Editor.
  5. Restart the Netlogon service (you may have to restart the computer).
NOTE: If you are using Regedit instead of Regedt32 to modify the registry, either

  • right-click Parameters, click New, and then click REG_DWORD-or-

  • click New on the Edit menu, and then click REG_DWORD
and then add the new registry key information.

More Information

MaxDgramBuffering Details

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 send commands. After this limit is reached, further send commands will fail due to insufficient resources.

For additional information on other possible causes of this error, click the article numbers below to view the articles in the Microsoft Knowledge Base:

259883 Upgrading Windows NT 4.0 Domain Controller with FAT File System Does Not Install Active Directory
269119 Logging on to a Domain Does Not Work from a Windows 2000-Based RAS Client


For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

217023 Event ID 5701 Starting Netlogon on Domain Controller

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