Change a Domain back to Workgroup

parcou
parcou used Ask the Experts™
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For whatever reason I cannot get machines to add back to my domain after adding a replacement Linksys G router so I want to put the Domain to a WORKGROUP

It was on shear experimenting that I figured out how to make this home Win2003 Server box to a domain and an active DC (with active directory running) and create logins for everyone in the small home office. I figure I may have an dns issue or lookup issue reason why when I try to add a new PC to the domain it does not find it nor can I ping it...before the new router no issues...but all PC's hit the web...all the current ones on the domain do see the server shares...

So how do I demote this Win 2003 Server to a workgroup...I understand there will be a change on the client side so I will fix all those with local logins...

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Commented:
Reinstall the operating system... it's one way only.
Systems engineer
Top Expert 2008
Commented:
Better to fix the DNS issue than downgrade the domain to become workgroup.
The reason for your DNS issue is propably that the linksys router hands out itself or ISP as DNS server in the DHCP lease to the clients.
The clients nead to use a DNS server aware of the AD DNS namespace. Change the DNS setting for the clients to point on the DC as DNS server to make them able to resolve the DNS domain used for AD.

If you must change it to be a workgroup, run "dcpromo" command on the DC to demote it.
To demote a domain controller you will need to run the dcpromo command.

ie click start / run / type dcpromo

This will demote your Windows 2003 Server from a domain controller to a member server. You can then remove the server from the domain to a workgroup. This will remove all logins you have created.

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Top Expert 2012

Commented:
Most likely you have don't have the correct DNS settings on the client or DHCP server which could be your router. Make sure that the DHCP server is handing out IP addresses with the Domain Controller as the only DNS server.

Also, make sure that the DC is only pointing to itself for DNS.

Author

Commented:
henjoh09

If I attempted this route before demoting the server what steps do I take...sure that is not a quick answer :-)

Author

Commented:
dariusg

you are right the router is the dhcp and the dhcp is not running on the server box....I guess it was pure luck that it worked beforehand before the router change

Author

Commented:
Or is it possible to config the router in such a way to keep it as the dhcp so that clients can still see the server to be added to the domain...
Top Expert 2012

Commented:
You can but the recommended solution is to allow Windows to provide IP addresses because of DDNS.

Author

Commented:
Demoted the serer as advised...

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