Ok, I've figured something out.
When you set up your port forwarding in your router, and add the server IP (which is your own computer's IP), everything's good.... but... most routers have a DHCP function and dynamically assign your computer a private IP like 192.168.1.X... The problem is that the lease isn't usually set to be indefinite, and when you turn off your computer, and turn it back on, the router may issue you a different IP from its scope.
The result is that the port forwarding server IP is now different from your computer's current IP, causing the incorrect configuration.
The way to fix this would be to set your DHCP lease, in your router, to indefinite (or by making a reserved IP for your computer). Or, simply configure your NIC to have a static IP address in the network your router's DHCP function advertises.
If anyone needs help with this, let me know.
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