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On-premise Servers cannot communicate with Windows Azure VM

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I have set up a VNet on Windows Azure and a VM as DC1 (abc.com) is added in this network. My on-premise servers ( RRAS & DC2 ) and computers are able to join to the domain through a site-to-site VPN connection to VNet. Each machine can communicate with each other without any issue. 

We recently have a new branch office in China, so, I establish a multiple site VPN connection to the VNet by following the tutorial below:
https://msdn.microsoft.com/en-us/library/azure/dn690124.aspx
I manage to connect the two sites, HQ and branch, to the VNet successfully.

Then, I added a new DC hosting a new domain (cn.abc.com) in the VNet. The branch office computers suppose to be joined to "cn.abc.com" domain but I am having issue where the local machines in the branch are not able to join the domain. I tried set the local machines DNS to the new DC IP address, which I used to do, this doesn't work like before. The local machines cannot ping the new DC, vice versa, but, I am able to ping the branch local machine from the old DC (abc.com).

Can anyone gives me some suggestion ? I am sorry for my poor explanation. I have been dealing this for two days and I am still struggling to fix this. Please  feel free to ask me if you need to know more while helping me out. Thanks so much.

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