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domain controller error id: 5807

central(main domain controller) London DC1------------------DC2(secondary) Mancester
                                                                       ------------------DC3(secondary) Liverpool

I am a central DC1 admin and i have two more DCs other cities.All are windows 2008 domain controller servers.

I get error
ID:5807
Description:
During the past 4.04 hours there have been 1000 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.

I controlled %SystemRoot%\debug\netlogon.log and there is :
10/21 18:01:55 TREND: NO_CLIENT_SITE: NB016 10.242.2.38

I use C Class IP addreses and wanted one more subnet for my new building computers.for that i did MASK: 255.255.240.0
  current network IP: 192.168.100.0 255.255.255.0
after create new subnet i changed all current IP and Device IPs :
     192.168.100.0 -255.255.240.0
and i created a new subnet under DC1 192.168.96.0/20

but get this error. I do not correct something?

Thanks for your comments
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apollo-13
Asked:
apollo-13
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1 Solution
 
Seth SimmonsSr. Systems AdministratorCommented:
NO_CLIENT_SITE means you have systems talking to those domain controllers to which the IP address is not associated with any AD site

you stated you are using a 192.168.x.x network though that error states the source machine is on a 10.x.x.x network meaning in AD you don't have a site associated with that 10.x.x.x network

because of that, that machine will try to locate any available domain controller in london/manchester/liverpool sites

if that machine on that 10.x.x.x network is in one of those sites, you need to create a subnet in AD sites and services and associate that with one of your 3 sites
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apollo-13Author Commented:
thank you so much for promt answer
i do not use any A class IP :10.x.x.x on my network
I use only 192.168.100.0/20 and for clients computer DCHP 192.168.99.0/20
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apollo-13Author Commented:
subnet
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Seth SimmonsSr. Systems AdministratorCommented:
something on your network somewhere is talking to your servers from that address
need to find out what that NB016 device is

1,000 connections in a 4 hour period i would find very suspicious
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apollo-13Author Commented:
ohhhhhhhhhhhhhhhhhhhh i see this is the VPN user .
if one of my vpn user login our system firewall give a 10.x.x.x IP.
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Seth SimmonsSr. Systems AdministratorCommented:
well, there you go

whatever location that vpn server is, then create a new subnet in AD and associate that with that site
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apollo-13Author Commented:
is that mean is I need to create a new subnet with ip :10.242.2.0/? in AD(dc1) sites and services.?
This address comes out hardware Firewall(VPN DHCP) when our user uses VPN connection.

after creating new subbnet under DC1 do i need to dc1 RESTART?
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Seth SimmonsSr. Systems AdministratorCommented:
yes, create that subnet and add to that AD site; it's irrelevant what server or device hands out the addresses

no, no need to restart but those warnings should go away
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apollo-13Author Commented:
i got this info from my VPN connection to central
DHCP IP/netmask of 10.242.2.22/255.255.255.252
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apollo-13Author Commented:
thank you so much ,no error any more
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