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Hi! I found that if upsd had been running, then another "upsd" was typed. The upsd.pid file would be deleted and the previous upsd could not quit normally unless using "pkill upsd". The second upsd detects port conflict, and then deletes the upsd.pid. As a result, any further "upsd -c stop" or "upsd -c reload" would detect no upsd.pid and simply quit. I