SSH-MULTIPORT.md

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SSH Multi-Port Setup (systemd + UFW)

This setup is already implemented in SSH Plus Manager. The script configures OpenSSH, systemd socket activation, and UFW for you. Use menu → [15] CONNECTIONS → SSH Multi-Port Setup to add/remove ports, run a quick multi-port setup, or verify the configuration—no need to edit files by hand unless you prefer to.

This document explains how it works and how to do it manually if needed: OpenSSH listening on multiple ports via systemd socket activation, with UFW controlling which ports are allowed. It matches the behavior of the built-in SSH Multi-Port Setup in the menu.

Tested on modern Debian/Ubuntu systems using ssh.socket.

Use cases:

• SSH over restrictive networks (e.g. 443, 80)
• Extra fallback ports (e.g. 3398, 8080, 8443)
• SSH-based tunneling or management on non-standard ports

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1. Run menu.
2. Choose [08] CONNECTIONS.
3. Open SSH Multi-Port Setup (or the option that runs the multiport script).
4. Use:
   • Add port — add one port (sshd + socket + UFW).
   • Remove port — remove one port from config and UFW.
   • Setup multiple ports (quick) — enter a comma‑separated list (e.g. 22, 3398, 443, 80, 8080); the script trims spaces and adds only ports not already in the config.
   • Verify setup — check listening ports and configuration.

The script expects UFW to be installed; it will refuse to continue if UFW is missing, so ports are not left unguarded.

For more troubleshooting (e.g. “Configuration validation failed”, lockout), see TROUBLESHOOTING.md.