New articles: UFW firewall management, Fail2ban Apache 404 scanner jail, SELinux Fail2ban execmem fix, updating n8n Docker, Ansible SSH timeout during dnf upgrade, n8n proxy X-Forwarded-For fix, macOS mirrored notification alert loop. Updated dca→dcaprod reference in network overview. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>