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After updating to PRTG 22.2.76, the PRTG core server does not start anymore. What can I do?

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After updating to PRTG 22.2.76, the PRTG core server does not start anymore and the log contains the following message:

Signature of \Program Files(x86)\PRTG Network Monitor\32 bit\PRTG Server.exe is not valid

or

Signature of \Program Files (x86)\PRTG Network Monitor\64 bit\PRTG Server.exe is not valid

What can I do to resolve the issue?

certificate prtg timestamp

Created on May 5, 2022 2:42:15 PM by  Florian Weik [Paessler Support]



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This article applies as of PRTG 22.2.76


Adding the trusted root certificate for timestamp signature after updating to PRTG 22.2.76

As of PRTG 22.2.76, the binary of PRTG includes a secure timestamp from DigiCert that uses an updated signature certificate as part of the digital signatures. As a result, the code signing signature fails on systems on which the following trust chain in the trusted root certificates of the Windows certificate store is missing:

App Registrations Tab
Click to enlarge.

This causes that the PRTG core server does not start in some cases.

You can resolve the issue by adding the trusted root certificate for timestamp signature. You can either use the Microsoft Trusted Root Certificate Program or download the certificate from DigiCert.

Microsoft Trusted Root Certificate Program

Follow the instructions here: Updating List of Trusted Root Certificates in Windows.

Download from DigiCert:

Download the root certificate DigiCert Trusted Root G4 here and import it to the certificate store on the PRTG core server system and probe system.

Created on May 5, 2022 3:04:26 PM by  Florian Weik [Paessler Support]

Last change on Jun 28, 2022 8:52:32 AM by  Florian Weik [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.