I have a fresh Debian-based VPS that I want to turn into an all-in-one hosting box running the latest ISPConfig 3. Your job is to install ISPConfig from scratch, harden the operating system, and leave me with a control panel that can immediately host sites, databases, and mailboxes under HTTPS. Here’s what I expect when you are done: • A clean, documented installation of ISPConfig 3 on my VPS (Debian / latest). • Web stack (Nginx, PHP-FPM, MariaDB/MySQL) ready for virtual hosts. • Fully working mail stack with standard protocols enabled so I can create domains and send/receive mail right away. • DNS, FTP/SFTP, and any required system users configured inside ISPConfig. • Security basics in place: firewall rules, automatic SSL via Let’s Encrypt, and Fail2Ban or equivalent protection. • Post-install notes that list every command or config file you touched, plus the admin login. a concise hand-over doc that proves websites load over HTTPS and a test mailbox can exchange messages externally.