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[Today's post comes to us courtesy of Shawn Sullivan]
You may have noticed that some of your computer accounts are not showing “online” in the SBS Console. The purpose of this post is to shed some light on why you may see this and how this information is obtained by the server.
Status information for your machines is displayed under the Network > Computers sub-tab in the SBS console.
The console will only display status information for domain-joined computers from the following three OUs:
Note: Replace domain and local with your domain name.
Regardless of whether you join a client or a server computer to the domain, by default it will always appear in the SBSComputers OU. Machine accounts for servers must be manually moved to the SBSServers OU .For more information, please visit: http://blogs.technet.com/sbs/archive/2008/09/24/why-does-my-sbs-2008-premium-second-server-display-as-a-client-computer.aspx
The server first queries DNS for the host A or AAAA record of the machine; IPv4 is preferred over IPv6 in this scenario. If an A record is found, the server will test this with an ARP request (ARP is used instead of Ping since many firewalls will block ICMP by default). However, if the machine is in a different subnet, the server will attempt to ping it. If only an AAAA record is found, the server will ping the IPv6 address for a response (IPv6 does not support ARP). Possible failures include
If the server receives a response from either the ARP request or the Ping, then a NetApi call is made to the machine for NetGetJoinInformation. This requires that “Client for Microsoft networks” and “File and Print Sharing” are enabled on the NIC and the proper exceptions are configured in Windows Firewall. Possible failures at this point included:
Such a very nice post! It helps me understand everything with SBS Console especially that I encountered the same error. Thanks for sharing this info! :)
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