Luigi worker fails to connect to central scheduler causing task cascade failure

Worker unable to establish connection to central scheduler at localhost:8082. Max retries exceeded (default 3 attempts with 30s wait between retries). Connection refused error indicates scheduler is unavailable or not listening on expected port. Causes all downstream tasks to fail.

Increase RPC connection timeout from default 10s to 60s, retry attempts from 3 to 10, and retry wait from 30s to 60s in luigi.cfg [core] section. Verify central scheduler is running and accessible on configured port. Alternatively, use --local-scheduler flag for single-worker scenarios. Consider adding process monitoring to auto-restart scheduler on crash.