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SSHD

Created: 2025-11-30

Updated: 2025-11-30

Hardened SSH daemon (SSHD) configuration guide covering authentication, cryptography, and security best practices

Architecture

Text

Internet
      │
      ├─► Port 22 (or custom port)
      │
      ▼
  ┌─────────────────────┐
  │   UFW Firewall      │ ← Rate limiting (ufw limit 22/tcp)
  └─────────┬───────────┘
            │
            ▼
  ┌─────────────────────┐
  │   Fail2ban          │ ← Ban after 3 failed attempts
  └─────────┬───────────┘
            │
            ▼