'ntp:ntp:home' changed from ONLINE to OFFLINE (COMMUNICATION_ERROR)

Hello, I have a problem that my garden lighting goes out spontaneously,
This is switched on when the sun goes down and normally it goes out with a time cron at 23:30
I have the following message that may have caused this

this is the rule in “ntp.tings” in folder openHAB-conf
ntp:ntp:home [ hostname=“nl.pool.ntp.org”, refreshInterval=60, refreshNtp=30 ]

 Error rules from "event.log"
2019-01-11 20:44:55.512 [hingStatusInfoChangedEvent] - 'ntp:ntp:home' changed from ONLINE to OFFLINE (COMMUNICATION_ERROR): The network connection to the timeserver nl.pool.ntp.org cannot be established -> returning current sytem time instead.
2019-01-11 20:44:55.568 [vent.ItemStateChangedEvent] - P1_Meter_DeliveryTotal changed from 27429.0800781250 to 27429.0830078125
2019-01-11 20:45:04.893 [vent.ItemStateChangedEvent] - Output11_4 changed from ON to OFF
2019-01-11 20:45:04.919 [vent.ItemStateChangedEvent] - Output11_3 changed from ON to OFF
2019-01-11 20:45:04.962 [vent.ItemStateChangedEvent] - Output17_3 changed from ON to OFF
2019-01-11 20:45:04.987 [vent.ItemStateChangedEvent] - Output12_2 changed from ON to OFF
2019-01-11 20:45:05.013 [vent.ItemStateChangedEvent] - Output12_1 changed from ON to OFF

All Wago outputs are from the garden lighting.

Does anyone know what the problem can be?

The NTP error shouldn’t cause an immediate issue, unless the system time of the device is way off. Doesn’t look like it is, judging by the timestamps in the logged message.

Anything in openhab.log?

My ntp item has the same error but it has no impact.

No, there are no weird reports?

What can this be?

2019-01-10 20:32:00.019 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:32:00.033 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:33:00.020 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:33:00.034 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:34:00.029 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:34:00.037 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:35:00.019 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:35:00.026 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:36:00.007 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:36:00.011 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:37:00.012 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:37:00.016 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:38:00.022 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:38:00.034 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:39:00.007 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:39:00.010 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:40:00.028 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:40:00.016 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:41:00.014 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:41:00.019 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:42:00.015 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:42:00.023 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:43:00.020 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:43:00.020 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:44:00.012 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:44:00.035 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:45:00.011 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!
2019-01-10 20:45:00.015 [INFO ] [smarthome.model.script.default.rules] - Trigger welke deuren gesloten zijn, elke minuut één maal!
2019-01-10 20:46:00.012 [INFO ] [smarthome.model.script.default.rules] - Trigger rule default.rules elke minuut één maal!

OK thanks
Then I have to check again tomorrow if there are other reports!