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Domain Controller cannot replicate - windows 2008 R2

Hi Experts,

My situation as below:

We are setting up a new domain for a branch office and we started by creating DC1 in the main office and DC2 in another branch office. We then start to build DC3 and DC4 with ifm media install method in the new branch office and moved the 3 domain's fsmo to DC3. As for some reason, we need to change the IP address of DC3 and DC4 using a differnet subnet range, and since then the replication stops replicating newly created objects on DC3 to other DCs.

I checked the repadmin /showrepl command and it shows the replication completed successfully.

Please help

4 Solutions
If DC3 and DC4 are using a differnet subnet range, you will need to create new subnet add it to AD sites and services and move DC3 and DC4 to the site that belongs to the new subnet.

Krzysztof PytkoActive Directory EngineerCommented:
Run on those changed DCs in command-line

ipconfig /registerdns

and additionally, go to DNS management console, expand _msdcs.domain.local zone and go to gc node. Review if all hosts (A) records have appropriate IP address

re-try AD replication

Sajid Shaik MSr. System AdminCommented:
It seems that before changing the IP adress the DC3 and DC4 replication was working as you have mentioned correct me if I am wrong.If this is the case you need to check the AD sites and services.
Create the new subnet and map the subnet to the appropiate site.

On the DC3 and DC4 as you have change the IP address you need to point the DND setting to itselft  i.e IP address of the server as prefered DNS server(assuming DNS role is installed on the server) and also add the alternated dns setting.

Ran the following command in cmd.
net stop netlogon
ipconfig /flushdns
ipconfig /registerdns
net start netlogon
net stop dns
net start dns
net stop ntfrs
net start ntfrs
gpupdate /force
repadmin /syncall /AdeP

Also reboot the DC once if possible and check.

Also check the below ports are open.
Port Assignments for Active Directory Replication
Service Name        UDP       TCP
LDAP                      389       389
LDAP                                    636
GC                                        3268
Kerboros                 88          88
DNS                         53          53
smb over IP             445        445

Reference article:http://technet.microsoft.com/en-us/library/bb727063.aspx

nokypleaseAuthor Commented:
yes it is the issue with site and service and it is fixed now, thanks everyone!

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