I updated the CUPSd.conf with the a amended version (along other fixes) and the server internal error went away however, printer is not responding. I want to go with print driver error/corrupted cause my Android and Dell Laptop w/ Zorin O/S print to my Canon TR8520 just fine. By the way , If I didn’t say thank you; Thank You to ALL who helped. This is a link you might find useful http status code 403 - Trying to access Cups' web interface gives error 403 - Stack Overflow