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‎07-24-2021 09:56 AM - last edited on ‎09-22-2025 12:07 PM by Retired

HP Recommended
Product: MacBook Pro

I have an HP LaserJet 100 color MFP M175nw  and for a while, the scanner is not working anymore. If I open the scanner via System Preferences -> Printers and Scanners I get the following popup mac popup:  You do not have permission to open the application “HP Scanner 3”  then the scanner dialog screen opens with the following message: Failed to open a connection to the device (-21345)

 

  • BigSur 11.5 (installed from scratch)

I tried the following:

  • Restarted the printer
  • Restarted my MacBook
  • Deleted printer from "Prnters and Scanners"
  • Uninstalled old drivers and HP Easy Scan
  • Installed HP App

The scanner is working from my Iphone with HP App so it is not broken.

 

Any ideas?

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