Networking

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Somewhat outside the scope of this community, but an easy answer...you opened your network to the internet. Hopefully you opened 443 (or your preferred port for HTTPS traffic entering your network) and forwarded it to your server so that Caddy could do its thing from there. That's the proper setup. Otherwise you're just opening ports for no reason and poking lots of holes in your firewall.

That said, you're bound to see some pings from bots/script kiddies as soon as you open your network up. Secure everything, use good passwords, etc...