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In this case, I would have a separate DNS server for each network who provide the service when the user is requesting it. or are u connecting 2 separate networks from one DNS server for any particular reason?
Well, in that cause go to check the static DNS number that you configured in the router. It should be the same ip address that you configured on the server, then check in the pc that the DNS number is the same in the computer. For example: router DNS...