Originally posted by The Profit
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Look at it this way.
Your router is what the internet sees. Your external IP address channels any requests to your router.
A port forward tells your router that if a request comes on, say, port 80 - then send it to the machine hosting HS3. That's why you need the port forward in the router on 80 for HS3.
Internally - inside your LAN - you're directly accessing the HS3 machine and your browser defaults to port 80 for HTTP. No need for a port forward. It's only from OUTSIDE your LAN that it is critical.
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