Active DIrectory at New Site

Hi guys,

I have 2 sites with a domain controller at each site.

I added a new DC at Site A, and it sees the other DC and syncs fine. Now the other DC at Site B, in AD sites & services, it doesnt see it.

Shouldn't it auto add and replicate to it?
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Seth SimmonsSr. Systems AdministratorCommented:
it will if that IP network is defined for the site; else it won't appear there
is there a subnet created for it and associated with site b?
Cobra25Author Commented:
Indeed there is.
Dan McFaddenSystems EngineerCommented:
Can you run a DCDIAG and post the results?

from elevated command prompt:  dcdiag /c /v

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Cobra25Author Commented:
DCdiag looks good, except its throwing an error with another DC thats on the same subnet?

Starting test: Replications
   ERROR: Expected notification link is missing.
   Source DC1
   Replication of new changes along this path will be delayed.
   This problem should self-correct on the next periodic sync.
Cobra25Author Commented:
ANy update on this guys?
Dan McFaddenSystems EngineerCommented:
You need to verify the tcpip config and specifically you should check how DNS is configured.

DNS service should be running on a specific IP address, not or all available.  In the ipconfig, make sure the each DC points to another DC as primary and itself as secondary.

Here is a link to the oft referenced best practice article.


After this has been done, run an ipconfig /registerdns.  Restart the netlogon service.

If the issue still persists, post the dcdiag results please.

Cobra25Author Commented:
Okay so my 2 servers in the same subnet/site are looking good

Now i have a remote site/subnet what should i do for that DC to create the connections?
Dan McFaddenSystems EngineerCommented:
Have you created a new site in AD for the other physical location?

In AD Sites and Services, create a subnet definition for the network address range at the other site, then create a new site, name it appropriately and add the newly defined subnet to the new site.

Cobra25Author Commented:
Yes, i already have it there and it was replicating. Here is how it is setup in AD Sites/Services, please let me know best practices:

Site A (HQ)
NTDS Settings
DC1 --> DC2, DC3
DC2 --> DC1
Site (Remote Site)
DC3 (empty)
Dan McFaddenSystems EngineerCommented:
At the remote site, there should be a site link between DC3 and DC1.


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Cobra25Author Commented:
Sorry Dan, i double checked:

Here is the correct one:

Site A (HQ)
DC3 - NTDS - DC1, and DC5
DC1 - NTDS - DC3

Site B (Remote)
DC5 - NTDS - I just added DC1 here, should i add DC3 also?

Do the remote site links have to be created manually?
Dan McFaddenSystems EngineerCommented:
Yes, you need to define sites and the links between sites.

Cobra25Author Commented:
OKay id id that, i think it should be OK, ill confirm.
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