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Downtime Inquiry

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Hi Paessler, we are currently monitoring the downtime of our sensors. We also had our notification setup for our sensors. We noticed that the we are receiving SMS notification for the sensors that have low latency (?). This is the exact message:

<Sensor Name> (Ping) Down ended (now: Unusual) (1 day interval average of 70 msec (Ping Time) is unusually low for this week)

Does PRTG counts this as a downtime? If yes, can we filter it? We only need the actual downtime of the status, not the high and low latencies of the sensor.

Thank you very much.

Regards, Gab

prtg-ping scanning-interval sms

Created on May 18, 2020 2:28:21 AM by  gvcruz (0) 1



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Hello Gab,

PRTG does not count the time the sensor spent in "Unusual" state as Downtime. The Unusual state is considered a "working" state (similar to Up state), the different is that here the sensor receives values that are unusually low or high for a specific part of a day or week.


Kind regards,
Sasa Ignjatovic, Tech Support Team

Created on May 18, 2020 9:40:25 AM by  Sasa Ignjatovic [Paessler Support]



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Hi Sasa,

Thanks for this. Is it also possible to prevent PRTG to notify us whenever the sensor is receiving a low and high values for a specific part of a day or week?

We only need the downtime of the sensor or at most the downtime and the high value for a specific part of a day or week.

Regards, Gab

Created on May 19, 2020 6:40:49 AM by  gvcruz (0) 1



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Hello Gab,

Unless you have set up a notification trigger for the "Unusual" state, you should not get any notifications for this state. One exception is when you have set up to receive a notification when the sensor leaves the "Down" state, in this case you will get a notification when the sensor goes from the Down state to any other state (in your case Unusual state).

If you do not want that the sensors go into "Unusual" state, then you can disable the "Unusual Detection" in the "Settings" tab of the "Root" group under "Advanced Network Analysis", that way this setting will be inherited to all other devices. If you want to turn it off only for specific devices, then you can do that by going to the "Settings" tab of that device (the option is the the same as for the Root group).


Kind regards,
Sasa Ignjatovic, Tech Support Team

Created on May 19, 2020 10:08:20 AM by  Sasa Ignjatovic [Paessler Support]



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Hi Sasa,

I checked our weekly report again and there was a downtime on one of our sensors. I verified the historic data of this sensor and there are some noted downtime on the 3rd column however, they are minimal around 15% in average. We can also see that the downtime has a corresponding high ping time. Does it mean that the high ping time is considered a downtime on the sensor?

Here's the screenshots. Please see link below.

https://maynilad-my.sharepoint.com/:f:/g/personal/gvcruz_mayniladwater_com_ph/EhZvWIHDXiJNijNus_riTC8BFwvprnPR78--NWfm-EJJKw?e=sqNJum (including http)

Regards, Gab

Created on May 26, 2020 12:51:12 AM by  gvcruz (0) 1



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Hello Gab,

High ping time is not considered as downtime, unless a limit is set in the sensor so he goes down when the limit is reached (which does not seem to be the case here). In this case if the sensor is set to send out multiple pings, you could get such results if some of the pings fail, or if they run into a time out. If you use the sensor with a short scanning interval (lower then 60 seconds), you may want to consider increasing it.


Kind regards,
Sasa Ignjatovic, Tech Support Team

Created on May 26, 2020 9:07:48 AM by  Sasa Ignjatovic [Paessler Support]



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Disclaimer: The information in the Paessler Knowledge Base comes without warranty of any kind. Use at your own risk. Before applying any instructions please exercise proper system administrator housekeeping. You must make sure that a proper backup of all your data is available.