Even I tried to join the computers which are in sub-branch network (192.168.10.0) to our Main branch domain still facing the same issue.
Below are the points I have tested.
*We can ping from AD server from Branch server *we can resolve the AD DNS names *assigned static IP to New server & added primary DNS as Main DC IP and checked *Checked by turning off domain firewall from both ends *Tried with enterprise & Domain admin user accounts while adding a tree. *Created branch site in active directory sites & subnets and mapped branch network subnet to site. *Added & allowed branch subnet(192.168.10.0/24) in domain firewall.
We are not facing this issue in other branches, we have recently created new DC in one of my sub-branch locations and we didn't face any issue while adding a domain controller.
we are facing this issue only from the particular branch. we have IP Sec tunnel establish from this branch to main branch and nothing restricted. Please suggest