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Instance(s) not found (code: PE236)

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This morning my device did a scheduled reboot at 06:00. Once the server was back up and running all sensors continues as expected except for one local drive. Pretty much all performance counters are red for this disk while other disks are continuing.

These stopped working Disk IO 2P: Physical Disk: Current Disk Queue Length 2 P: Physical Disk: Disk Reads/sec 2 P: Physical Disk: Disk Writes/sec 2 P: Physical Disk: Percent Disk Time 2 P:

While Volume IO P: is still green and reporting accurate data.

How can I get them to work again?

pe236 physical-disk reboot wmi

Created on Jul 24, 2017 7:14:52 AM by  wbolten (60) 1 1



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Dear wbolten

This might sound weird, but please add a Windows Uptime sensor to that device. Does that bring the other WMI sensors back?

Created on Jul 25, 2017 2:09:39 PM by  Arne Seifert [Paessler Support]



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Hi, I am sorry I missed this answer. Unfortunately my co-worker decided to delete them and re-add them. Loosing the historical data. Hence why i forgot about this post.

When it happens again I will try the uptime sensor.

Created on Sep 15, 2017 2:22:23 PM by  wbolten (60) 1 1



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I'm having the same problem. I've created the sensor 11/10/17, next the sensor started to work ok and was up. Today 11/13/17 Enterprise Console asked me to restart the console. And then I've lost the sensor (in fact I have 8 sensors failing since then). Uptime sensor was already active so I can't activate it to see if that wakes other sensors, buy obviously the presence of Uptime sensor doesn't make other sensors to work. Any advice?

Created on Nov 13, 2017 8:42:00 PM by  Djago (0)



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In this case, please use the WMI Tester. Enter the address and credentials for that device and do a WMI query. Does that work? If you want to test the query for a specific sensor, please do a custom query according to this article.

Do you get an error message, or a result table?

Created on Nov 14, 2017 1:28:04 PM by  Arne Seifert [Paessler Support]

Last change on Nov 14, 2017 1:28:47 PM by  Arne Seifert [Paessler Support]



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Hopefully, this may help someone. I've found that if you're using iSCSI disks, that they don't always retain the same disk number. It seems to go by the disk number and not the drive letter. So, if PRTG is looking for X: as disk 12 and it changes on next connection to disk 13, you will get this error until you re-add the disk. Unfortunately, you will lose all the history for the sensor.

Created on Nov 1, 2019 2:05:17 PM by  bdaly (10) 1



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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.