domain scan over VPN connection

domain scan over VPN connection

I am connecting to a client's VPN, and attempting to do a windows domain scan over this VPN connection, but cannot get it to show the OU. It jumps directly to scanning, but then shows 0/0 workstations. It scans for a few minutes, then comes back that it is completed, but no workstations found. This domain scan works if I am locally connected to the client's network (already enabled all firewall settings, etc) because we installed the free version on the client server, but we want to manage this information in a central location on our server. Please help.

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