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Bandwidth shaping rather than hard slots: use token-bucket or rate-limiting per-client to allow more concurrent flows without saturating links.
Health checks and circuit breakers: detect and isolate malfunctioning clients that hold slots without progress.
Backpressure to clients: return informative error codes or retry-after headers so clients back off gracefully.
Logging and monitoring: track slot usage, request duration distributions, and slow-transfer origins for targeted fixes.
Some download managers keep connections alive. If many users pause and resume, slots may remain reserved longer than necessary.
Temporary, but unpredictable.
Thus, the error is a capacity bottleneck, not a permanent block. Bandwidth shaping rather than hard slots: use token-bucket
