Advanced Server Security Hardening Advanced

Category: Hosting

# Server Security Hardening

## Firewall Rules

### UFW (Ubuntu)
```bash
sudo ufw default deny incoming
sudo ufw default allow outgoing
sudo ufw allow 27960/udp # Q3A
sudo ufw allow ssh
sudo ufw enable
```

### iptables Rate Limiting
```bash
iptables -A INPUT -p udp --dport 27960 -m state --state NEW -m recent --set
iptables -A INPUT -p udp --dport 27960 -m state --state NEW -m recent --update --seconds 1 --hitcount 20 -j DROP
```

## RCON Security
1. Use strong password (20+ chars)
2. Change default RCON port
3. Whitelist admin IPs only

## Anti-Cheat
- Enable PureServer mode
- Use sv_pure 1 (force client pak validation)
- Install server-side anti-cheat plugins

## Monitoring
```bash
# Log suspicious connections
tail -f /var/log/q3server.log | grep -i "flood"
```

## DDoS Mitigation
- Use OVH/Cloudflare DDoS protection
- Rate limit connections
- Implement connection flood protection

Difficulty:
Advanced

Category:
Hosting

Last Updated:
Mar 8, 2026