Accessing file shares on DC on Azure

Hi,

I recently moved a domain controller VM to Azure. I configured point-to-site VPN to connect with the vNET attached to the moved domain controller. I was able to RDP and ping to the VM on Azure but couldn't access file shares on that particular server. 

Then I demoted the server domain and tried again and I was able to access the file share without a problem. 

Any idea why I can't access the file shares when DC role is installed. 

Thanks

Janindu Nanayakkara