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Client machines whose IP addresses don’t map to any of the existing sites in the enterprise

Resolving NETLOGON event.

Log Name:      System
Source:        NETLOGON
Date:          12/31/2014 5:54:40 AM
Event ID:      5807
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      DC01.CAREEXCHANGE.LOCAL
Description:
During the past 4.25 hours there have been 75 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.

Start – Run – %SystemRoot%\debug\netlogon.log

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Open Active Directory Sites and Services

Right Click Subnets – New Subnet

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Enter the Missing ranges to the appropriate site.

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Satheshwaran Manoharan
Satheshwaran Manoharanhttps://www.azure365pro.com
Specialized in Microsoft Azure - Office 365 / Microsoft Exchange; conducted numerous projects worldwide in designing, supporting, and implementing messaging and virtualization infrastructure for medium-sized and large enterprises. Further, I am a Cloud Architect and Technical Advisor for various start-ups.

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1 COMMENT

  1. Hi
    Thanks for sharing
    just wanted to add there is a script in technet gallery that will parse all these netlogon logs and create list for your of subnets thats missing

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