BambuStudio connects to undocumented proprietary ports 2024-2026
on A1/P1S models during the print flow. The proxy wasn't forwarding
these ports, causing connection refused (RST) and triggering the
access code dialog instead of printing. MQTT and FTP worked fine —
port 2024 was the sole blocker.
Added transparent TCP pass-through proxies for ports 2024-2026,
following the same pattern as the existing FileTransfer (6000) and
RTSP (322) proxies. Silently ignored on models that don't use them.