After a sensor leaves Down state, the ping sensor goes through an Unknown state and then Up.
Why go through an unknown state instead of directly up?
In what case does the sensor become unknown even if the probe is running?
Why go through an Unknown state instead of directly Up?
Modified on 2025-06-10 15:43:46 +0200
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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.
Hello,
Usually the sensor should go directly Up again, if the scan was successful. The unknown state means that PRTG has no information about the sensor at that time.There can be various reasons why sensors show an Unknown status. For example the sensor has not received any data yet or there is an error in the (network) communication.
Apr, 2020 - Permalink