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HOWTO
CERTIFICATES
INSTALL PRIVATE KEY AND CERTIFICATE INTO AN HP PRINTER

Published: 20190119

Tested on:
Model: HP Color LaserJet MFP M477fdw
Firmware: 20180201

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• Make sure you have key and certificate joined in a PFX-file [1]
• The PFX-file needs to be exported with a password [2]
• Login to the WebGUI
• Press the tab called "Networking"
• In the left menu, under "Security", press "Certificates"
• Under "Printer Certificate", press the "Configure" button
• Choose "Import a Certificate and Private Key"
• Press "Next"
• Press the button called "Choose File"
• Locate the PFX-file and press "Open"
• Enter the PFX-file export/import password in the "Password" field [2]
• Press Finish
• You will now get a page saying "The printer certificate has been updated."
• Press the "OK" button
• Next time you point the browser to the printer WebGUI, the certificate should be proper

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[1]:
If your key and certificate are in PEM-format, you can convert them to PFX with this command:

openssl pkcs12 -export -out <hostname>.pfx -inkey <hostname>.key -in <hostname>.crt  

Don't forget to set an export password

[2]:
The HP Printer WebGUI doesn't support PFX-files without password