Reinstall the Printer Under the LPD Protocol
Empty the Trash folder, turn off your Mac and unplug your printer.Navigate to /Library/Printers and drag your printer folder to Trash.Click on Delete Printer to remove the device.Remove and re-add your printer from the Printers & Scanners System Preferences. Locate and select your printer in the list.The credentials for the respective driver expire after a given period, which makes the printer unusable. This error often occurs when an AirPrint driver is installed and set as Secure AirPrint. The quickest way to get rid of the “ Encryption credentials have expired” error is to reinstall your printer. Mac Says Your Printer’s Encryption Credentials Have Expired Reinstall the Printer Using the AirPrint Protocol Reinstall the Printer Under the LPD Protocol.Reinstall the Printer Using the AirPrint Protocol.Mac Says Your Printer’s Encryption Credentials Have Expired.Problems can arise when your hardware device is too old or not supported any longer. This will help if you installed an incorrect or mismatched driver. Try to set a system restore point before installing a device driver. It is highly recommended to always use the most recent driver version available.
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