A Pelco Pro Sarix camera (IMP-1110) failed to send motion notifications on a Windows Server 2012 system running the the Explicit Congestion Notification (ECN) service. The ECN service and Pelco plugin use the same TCP port 8575; if the ECN starts automatically after system startup, the notification subscription from the Pelco plugin can fail, meaning that motion detection notifications are not sent from the camera.
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As a workaround, stop the ECN service in Windows Server 2012. The Pelco plugin could be changed to use a different listener port in a future release.