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- **FTP Proxy Cannot Bind to Port 990 in Docker** — The `cap_add: NET_BIND_SERVICE` in docker-compose.yml didn't reliably propagate to the Python process when running as a non-root user (`user:` directive), depending on the container runtime's ambient capability support. Now sets the file capability directly on the Python binary in the Dockerfile via `setcap`, which the kernel honors regardless of runtime configuration.
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