Errors in event viewer

Posted on 2009-04-16
Last Modified: 2013-12-05
Hi I am getting errors on my primary DC event viewer. Can anyone tell me what it means:

During the past 4.25 hours there have been 4241 connections to this Domain Controller from client machines whose IP addresses don't map to any of the existing sites in the enterprise. Those clients, therefore, have undefined sites and may connect to any Domain Controller including those that are in far distant locations from the clients. A client's site is determined by the mapping of its subnet to one of the existing sites. To move the above clients to one of the sites, please consider creating subnet object(s) covering the above IP addresses with mapping to one of the existing sites.  The names and IP addresses of the clients in question have been logged on this computer in the following log file '%SystemRoot%\debug\netlogon.log' and, potentially, in the log file '%SystemRoot%\debug\netlogon.bak' created if the former log becomes full. The log(s) may contain additional unrelated debugging information. To filter out the needed information, please search for lines which contain text 'NO_CLIENT_SITE:'. The first word after this string is the client name and the second word is the client IP address. The maximum size of the log(s) is controlled by the following registry DWORD value 'HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Netlogon\Parameters\LogFileMaxSize'; the default is 20000000 bytes.  The current maximum size is 20000000 bytes.  To set a different maximum size, create the above registry value and set the desired maximum size in bytes.

This is only 1 of many but basically the same error at different times. I am assuming it is because we have machines that are not added to our domain but still have users authenticating to network resources on our domain.
Question by:Thomas N
    LVL 15

    Accepted Solution

    Not necessarily.  What it means is that you have subnets that are not assigned to a site.  For instance if you have people connecting via VPN and have assigned a separate subnet to VPN connections but have not assigned that subnet to a site.

    Author Closing Comment

    by:Thomas N
    Just checked and you are correct. Thank you.

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