Demote and promote domain controller for new domain

I have  active directory with 4 remotes sites and subnets, a remote site connected via VPN has a domain controller. this remote is being bought out by another firm who like to keep the IT equipment. I am planning to demote the server and set new local admin password for the server and workstations, and the on the server
-remove from current domain
- remove DNS server config
- remove VPN
-promote server to domain controller of a new domain with DNS and dhcp
- join all workstations to new domain

as the site has 1 server, it is also running file, print and some applications along with it being part of DFS

anything else I need to consider?
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ExchangeKBAsked:
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hastech12Connect With a Mentor Enterprise Solutions ArchitectCommented:
Much like Andy said, i would do it in this order

- Disjoin PC's from existing Domain.
- Demote the server from the existing doamin.
- Clean up the old AD environment as per the following Technet article.
- https://blogs.technet.microsoft.com/canitpro/2016/02/17/step-by-step-removing-a-domain-controller-server-manually/ 
- I would rename the server to be something more suitable to the new organisation.
- Setup and configure DHCP
- Setup and configure DNS
- Do a "dcpromo"
- Once the new DC is up and running
- Create new OU for Domain PC's
- Segment them out if possible, either according to departments, management or the like
- Join PC's to the new domain and add them to the new OU.
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AndyIt ConsultantCommented:
You may also want to remove the devices from the domain before demoting and create a workgroup so the users can still use the shared resources.
Does the server run DHCP?
Ensure that clients get a new DNS server setting so they can access the resources or edit the hosts file.
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ExchangeKBAuthor Commented:
Thanks Andy/ Hastech.
As i have found out, the organization structure will remain and the office is being franchised. To reduce the work involved, would it be worth breaking the VPN and once connection is terminated from my Domain controller, I can force transfer the FSMO roles to this server, meaning no work will required on the workstations. May be need to reconfigure DNS, but then i get to keep the group policy etc. Any thoughts ?
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AndyIt ConsultantCommented:
That is a possible solution, I would make sure you change any passwords used though to ensure you remain secure on your side.

Also, you may need to perform a metadata cleanup on both sides to remove any old references.
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ExchangeKBAuthor Commented:
Any ideas on Roaming profiles if chose to demote and promote ?
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AndyIt ConsultantCommented:
I think there could be some admin required.
You'd need to ensure this is still configured and tested, make sure you have a backup just in case, roaming profiles can behave oddly when moved around, and in some scenarios deleting files when moved.
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hastech12Enterprise Solutions ArchitectCommented:
If you break the VPN and that DC is now effectively a standalone MemberServer/DC, I would check if the users are using it to for AD auth or if they are actually authenticating to the main DC back at HQ.

There is a command line prompt to trace the auth server that the users are using.  I cant remember it off the top of my head right now, but will update you with it later.

If the users are authenticating to the main server and you break the VPN they may not have a DC to authenticate to.  

Can you advise what roles you have on this server?  Ignoring the ones that you may need to add later once its a standalone server.
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