Unable to connect my second server machine with Pdc

Hello Mayank sir

I have setup a two virtual machine in virtualbox and first one is windows server 2012 which is PDC and second one whi h is also windows server 12 but i want to add this machine to my PDC. When i do that its not letting me do that and even though i can ping from all the machine to each other and internet is working on all.
So i setup the network setting on all of them as automatic and thats when i can able to run internet on all three including the host machine.
What should i do?
I did try putting manual ip on host machine but then it disconnect me from the internet and same on other vm machine if i try to assign static ip to them
Can you please tell me how i can resolve this issue.

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