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I too have an HP printer running on a Mac that after one day of operation decided that the "Encryption Credentials have expired".     This has almost rendered the printer useless.  It won't print over the WiFi or the USB cable.  Fortunately the USB port currently works but that is not how I excepted a new machine to work.

 

I have read the work around but like previous authors I don't have a windows PC to use to access the web page suggested.   

 

Can anyone suggest a work round from a Mac machine, and give some idea how long this work around will last?

 

Bill

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