This is probably common knowledge for most people here but thought it could be useful Apply for a license from HAK5 C2 Get a Public IP such as (64.15.17.23) for your server Get a public domain and point the dns record such as "cave.domain.com" to the IP 64.15.17.23 Allow the DNS propagation to take plus I usually wait around 24 hours as Let's Encrypt DNS seems to be delayed a bit Ensure your servers firewall inbound rules allow "http (80) and https (443)"