Caddy won't start - Could not start HTTP server for challenge -> listen tcp :80: bind: permission denied

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When I uncomment those lines Caddy starts just fine:

root@sheaf:~# vim /etc/systemd/system/caddy.service

[make changes]

root@sheaf:~# systemctl daemon-reload
root@sheaf:~# systemctl restart caddy
root@sheaf:~# systemctl status caddy
● caddy.service - Caddy HTTP/2 web server
   Loaded: loaded (/etc/systemd/system/caddy.service; disabled; vendor preset: enabled)
   Active: active (running) since Sun 2017-08-20 00:34:30 UTC; 3s ago
	 Docs: https://caddyserver.com/docs
 Main PID: 19747 (caddy)
	Tasks: 6 (limit: 4915)
   Memory: 1.7M
	  CPU: 48ms
   CGroup: /system.slice/caddy.service
	       └─19747 /usr/local/bin/caddy -log stdout -agree=true -conf=/etc/caddy/Caddyfile -root=/var/tmp

Reverting those changes causes it to revert back to its prior failing state. What do you think is going on and why would I have to uncomment those lines?

Cheers,

Bob.

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