TCP / UDP port number reverts to 6881 after any settings change · Issue #10886 · qbittorrent/qBittorrent · GitHub
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QNAP TS-109 / TS-109 Pro / TS-209 / TS-209 Pro Application Notes
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QNAP - Multiple outgoing connection on UDP port 6881 - Jérémy Verda's IT Blog