Patching Domain controllers on different days. Can this cause issues

You fellas are awesome. Thanks for the peace of mind.

We have a few domain controllers that need to be patched. 2 for one of our locations and 2 for the other. They are both on different subnets however they do replicate AD information. My plan were to patch the two domain controllers tonight for one of our locations. Then patch the others on a different night for the other locations. My question is will this cause any replication issues since the two DCs would have different updates and service packs? I remember having this issue with exchange when I did this but Exchange was in a DAG which the AD boxes arent. Any replies are much appreciated.
This topic first appeared in the Spiceworks Community

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I’m glad to be of help to you!
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Support, contact [email protected]

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Hi,
As there is server 2012 DC (SERVER1) DC is operational in a domain then "This domain controller is the last controller for the domain" should be remain unchecked when you demote SERVER2 DC.
If you are getting error "Active Directory domain controllers for that domain can be contacted" while demoting SERVER2 DC then check the DNS pointing on both as per below article, disable windows firewall on all DC, less possiblities but worth to check if both
are different site then check the ports are open on firewall.
http://abhijitw.wordpress.com/2012/03/03/best-practices-for-dns-client-settings-on-domain-controller/
http://technet.microsoft.com/en-us/library/cc766337(v=ws.10).aspx
http://social.technet.microsoft.com/wiki/contents/articles/584.active-directory-replication-over-firewalls.aspx
run “ipconfig /flushdns & ipconfig /registerdns“, restart DNS server and NETLOGON service on each DC and try to demote server2 DC.
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NOTE: If initial replication was completed between both DC (new 2012 and old DC) then you may remove the server2 DC from Active Directory forcefully (DCPROMO /FORCEREMOVAL) and perform metadata cleanup.
Active Directory Metadata Cleanup
http://abhijitw.wordpress.com/2012/03/03/active-directory-metadata-cleanup/
Best regards,
Abhijit Waikar.
MCSA | MCSA:Messaging | MCITP:SA | MCC:2012
Blog: http://abhijitw.wordpress.com
Disclaimer: This posting is provided "AS IS" with no warranties or guarantees and confers no rights.

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Patching Domain controllers on different days. Can this cause issues

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