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I have a few sites on a VPS that have subdomain development areas (so [www.example.com](https://www.example.com/) and [dev.example.com](https://dev.example.com/)). I’m looking for the best way to “lock down” security-wise the dev domains so that any forms, pages or older plug-ins are inaccessible from the net.
I’m seeing solutions such as:
Wordpress plug-ins, htaccess, password protecting pages, coming soon, maintenance mode, etc and I am wondering if there is a **best way to essentially hide the subdomain or wordpress installation** from bots/attackers.