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- Add request_terminate_timeout = PHP_MAX_TIME in start.sh: without this (default 0 = disabled) workers blocked on a slow DB query, stalled Redis connection, or hung syscall are never reaped. Over time they fill pm.max_children and Apache returns 502 Bad Gateway to the reverse proxy. - Set pm.process_idle_timeout = 300s in Dockerfile: the upstream default of 10 s kills all idle workers after a brief quiet period. The next request burst must then wait for fresh PHP-FPM forks; on a loaded host that spawn latency can push Apache past its FastCGI deadline and produce a 502. 300 s keeps a warm pool through normal desktop-sync polling cycles. - Add a dedicated 502 troubleshooting subsection to reverse-proxy.md documenting the six most common causes (proxy timeout, worker exhaustion, stuck workers, Redis session lock contention, container cold start, Caddy cert renewal) with actionable diagnostics. Agent-Logs-Url: https://github.com/nextcloud/all-in-one/sessions/2fd7a6d1-bfdb-4f26-a8d0-cd54a7307999 Co-authored-by: szaimen <42591237+szaimen@users.noreply.github.com>