most likely you restarted your computer / router and you got a new internal IP so your port forwarding is no longer valid.

For this reason routers typically have a “Static DHCP” section where you can assign a static internal IP for the MAC address of your PC so that each time that computer is requesting an IP address from the DHCP server of the router, it will give them the exact same one.

Basically set up a static DHCP for your computer’s MAC and then double-check that the port forwarding is done to that internal IP

2 Likes