@wingers1290 Unfortunately the linked page doesn’t exist anymore.
I found this post by searching more posts from you like this: Best Way to Protect from Hackers? - #18 by wingers1290, which seems to be great!
I think you could maybe re-publish an article about how to secure an HA installation? The official “manual” is quite small and doesn’t cover a few things you wrote about (DMZ, …) and you could help a lot of users with that. Or maybe integreating those thoughts in the official manual @admins @moderators ?