Access local server

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bertmelis
Access local server

I'm having trouble accessing my local webserver.

My network:

ISP modem/router --> Netgear R7000 --> (LAN with client and server)

The client can access the webserver (port 80/443) only thourg it's ip-address. Using the dyndns name I get a 403 (I don't know from which router, it is not the webserver itself)
My smartphone (wifi turned of, so outside of LAN) can access the server via it's DYNDNS-name.

Port forwarding is setup on ports 80 and 443 on both routers.

My Netgear R7000 is runnign AdvancedTomato.

Any help so I can reach my server inside the LAN using the dyndns name?