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Exchange Powershell sensors stopped working after installing KB5001779

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After installing Security Update For Exchange Server 2016 CU19 (KB5001779), our Exchange 2016 Powershell sensors are giving the following error:

"The sensor was able to connect to the device using Remote PowerShell but could not retrieve access to Remote Exchange Management Shell. Ensure that remote management is enabled on the Exchange Server and the user has sufficient rights. See https://kb.paessler.com/en/topic/54353 for details. The syntax is not supported by this runspace. This can occur if the runspace is in no-language mode."

exchange-powershell exchange2016 remote-powershell

Created on Apr 14, 2021 1:23:57 PM by  jdensem (2) 1



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Hey there,

Unfortunately, several customers have reported exactly this behavior after the Exchange update. In software development, it is unfortunately sometimes the case that one manufacturer (in this case Microsoft) changes something and others then have to follow suit.

We have to analyze the problem and I hope that my colleagues from development can offer a hotfix soon. This also means, that unfortunately, I can't offer you a quick solution at the moment and ask for your patience.

Best,
Sven Roggenhofer [Paessler Technical Support]

Created on Apr 14, 2021 1:26:14 PM by  Sven Roggenhofer [Paessler Technical Support]



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Hi, we have currently the same issue after the latest exchange patch

Created on Apr 19, 2021 7:59:21 AM by  jodewee2 (0)



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Please note this.

Created on Apr 19, 2021 8:05:33 AM by  Sven Roggenhofer [Paessler Technical Support]



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Still doesn't work with elevated rights. Apparently Microsoft has changed how remote calls on Exchange are done, so the PRTG sensors are going to need to change.

https://techcommunity.microsoft.com/t5/exchange-team-blog/released-april-2021-exchange-server-security-updates/ba-p/2254617

Created on Apr 20, 2021 4:16:58 PM by  jdensem (2) 1



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Hi, there's going to be an updated PRTG version with the fix which should be release this week.

Created on Apr 20, 2021 6:16:13 PM by  Miguel Aikens [Paessler Technical Support]



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Updated to 21.2.67.1562 this morning and the sensors in question are now working again. Thanks!

Created on Apr 21, 2021 4:43:27 PM by  jdensem (2) 1



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