You can't. That's what NAT and port mapping is for. The router has to be
configured to remap your request onto another computer in the network.
So the router itself has to be told to reroute all incoming requests on
port 8000 to 192.168.0.37 port 4000. To put it simply, you can't
directly access a computer in a private network from the outside. That's
what makes is more secure.
So if this is something static, you'll need to configure your router and
then just connect to the outside IP and let the router take it from there.
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