Sure we do. NTG has 2 datacenter locations, with DCs in each. IT-ADMIN only has 1 datacenter location, so putting a DC at the remote site would be a good idea. If he/she had another datacenter location, it would be less of a concern.

he not she, hhhh
thanks for your suggestion, i know that the best idea is to have an additional DC in the remote location, i will try another machine and promote it in the branch office, i will not give up, because i doubt the previous ADC has something wrong in its system, if it doesn't work i will try RODC