A Syslog type collector does not collect events and logs a NullPointerException error in the collector log.
In the collector log you see the error: SensorJob cannot open device: java.lang.NullPointerException.
In the ucf.log you will see messages that the events were dropped because the event was not accepted by any receiver.
In this situation when you compare the Syslog Collectors Order between the WebUI and SSIM Client, the position of the collector having the problem does not match.
To fix this, change the position of the collector in both interfaces so they are the same.