When the Netlogon service starts or the service is under load, the following event may be logged to the Event Log:
Event Type: ErrorEvent Source: NETLOGONEvent Category: NoneEvent ID: 5719Date: 9/28/2001Time: 4:12:55 PMUser: N/AComputer: ServerDescription: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. Data: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:
On the Edit menu, click Add Value, and then add the following information:
Value Name: MaxDgramBuffering Data Type: REG_DWORD Value: 0x40000
Quit Registry Editor.
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.
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