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[Today’s post comes to us courtesy of Wayne Gordon McIntyre from Commercial Technical Support]
You may find yourself in a scenario where your SBS 2008 server has died and you have no backups available, however you do have a second non-SBS domain controller that is still operational which contains all of your domain information. The steps below will guide you thru rejoining the SBS 2008 server back into the existing domain so you do not have to recreate all of your AD objects and rejoin your client machines.
*** Please note that this is not a replacement for doing regular backups. Our recommended method to recover a server in these situations is to restore from a good backup. You should only do this if you have no other choice because there is no good backup to restore from. ***
Preparation and Clean Up Steps:
*** IMPORTANT: If the server was not a global catalog, make it a GC and wait for the Directory services event log to log event 1119 that states the server is now acting as a global catalog server. As a sanity test you can use ldp.exe to confirm that the server is responding to requests on port 3268. For these steps please see the appendix.***
216498 How to remove data in Active Directory after an unsuccessful domain controller demotion
** Please note you have to type “Activate Instance NTDS” in ntdsutil if it is a 2008 DC before you do the meatadata cleanup steps. Also if any FSMO roles were not seized in step 3, the updated version of ntdsutil (2003sp1 and greater) will perform the seizure of the remaining FSMO roles.
Post Migration Install Steps
Using LDP to verify GC functionality
To test replication between the 2 domain controllers run Repadmin /showrepl. The output should show successful replication for all partitions. For more assistance on using repadmin please see the following Technet link.