Whether to open the firewall for the ports in services.deluge.config.listen_ports. It only takes effet if services.deluge.declarative is set to true
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It does NOT apply to the daemon port nor the web UI port. To access those ports securely check the documentation https://dev.deluge-torrent.org/wiki/UserGuide/ThinClient#CreateSSHTunnel or use a VPN or configure certificates for deluge.