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Authentication & single sign-on service
Plugged into Reverse proxy, routing to each service by name
With a wild card cert so there are no name leaks.
Make your urls unexpected. If your domain is example.com, don’t put your jellyfin server at jellyfin.example.com. Instead, use watch.example.com or telly.example.com. Anything that’s memorable to you about what the service is without using a specific brand name.
With a wildcard dns record to point all names to your IP, and a wildcard certificate that works for all names loaded on your load balancer, it becomes hard for a hacker to know what name to use to get the load balancer to send them to the service they want to hack.
If you then use a sso tool like traefik’s ForwardAuth middleware, you won’t even get to the service until you’ve first authenticated.
If you use TLS like you should, your domains will be on the internet in the certificate transparency log. Yes, you should use a wildcard cert if you want this security by obscurity, but it's still security by obscurity.
Of course. The goal here is to not advertise. Make it hard for the bots to find you. With these steps, they can try your IP, but there’s nothing directly on your IP.
You still need proper security. Authentication is a good start, and it has the extra effect of adding an extra layer to prevent the bots from going further if they get lucky and guess a host name.