How to Disable PCDN in QQ Music Desktop Client to Prevent Upstream Bandwidth Consumption
The article explains that QQ Music desktop client can unexpectedly upload large amounts of data by acting as a PCDN node, but users can easily stop this behavior by disabling the playback acceleration service in the client settings, preserving their upstream bandwidth on both Windows and Mac.
Blue Dot Net received user feedback that a user of the Tencent QQ Music desktop client noticed abnormal network traffic, and after investigation confirmed that QQ Music was uploading a large amount of data.
The issue is easy to diagnose: using traffic monitoring tools while playing songs normally in QQ Music shows that playback primarily downloads data, not uploads; thus multiple concurrent connections consuming upstream bandwidth indicate this behavior.
This is not surprising, as many music and video clients in China treat users as PCDN nodes.
In recent years, many provincial and municipal operators have cracked down on personal users who upload large traffic via PCDN or PT, sometimes requiring a broadband installer to take photos and users to sign guarantee letters before unblocking.
However, operators seem reluctant to confront software companies, and have not blocked upload traffic from these clients.
Good news: QQ Music client, like other video clients, enables PCDN by default but provides a user switch to disable it, preventing upstream bandwidth usage.
To disable PCDN in QQ Music desktop client: open QQ Music, go to Settings, uncheck "Use playback acceleration service"; testing shows upstream bandwidth is no longer consumed by QQ Music.
Note: this issue affects both Windows and Mac QQ Music clients, so the setting must be turned off on each.
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