Description of the Issue:
- Fresh install of a supported version of Microsoft Windows server operating system ie: Windows 2012, 2016
- Attempting to install NPrinting 19, June 2019 release
- When installing with a dedicated NPrinting service account, the installation and operation of NPrinting is successful and work normally (services are working as expected)
- When re-installing - or upgrading - NPrinting (and or NP Engine) with a different/new dedicated NP service account, a problem with certificates is discovered in the NPrinting web engine log files.
Web Engine client certificate not found in store. Generating a new certificate from RabbitMQ CA key
Unable to start WebEngine service. ERROR: System.InvalidOperationException: Found 0 certificates for RabbitMQ Certification Authority
- NPrinting Engine and NP web engine will be installed normally however the NP Engine and Web Engine services will not start and or fail to remain in a 'running' state.
Environment the issue was discovered:
- June 2019 release of NPrinting
Environments affected:
- All versions of NPrinting from November 2018 to June 2019
Cause:
- The use of certificate communication between the NP engine and NP server started with November 2018 release of NPrinting.
- With the affected versions NPrinting, the installation program is unable to remove certificates associated with previous Windows user account use to install NPrinting with. These certificates must be removed manually,
- Note: if unable to manually delete the certificate while logged on as a Windows Administrator user account, please contact your Windows Group Policy Domain administrator and advise them of this restriction of Group Policy so they can amend group policy as needed
Resolution:
- Upgrade to the latest version of NPrinting. The has been in place since NPrinting September 2019 release.
Workaround:
- Uninstall the NP Engine software
- Open "Manage computer certificates" from the Windows search bar
- Go to Trusted root Certification Authorities then delete the certificate NPrinting-CA
- Delete the NP engine in the NP engine manager under Admin>Engine manager in the NPrinting Web Console.
- Next, re-install the NPrinting Engine software (type/document the certificate password used as you will need it in the next step)
- Add a new NP engine in the NP engine manager under Admin>Engine manager in the NPrinting Web Console (insert certificate password when prompted)
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