Canon imagePROGRAF PRO-300 PRO-300 series User Manual - Page 446

Check3 If using WPA/WPA2 key or a password, make sure encryption key for computer, network device, and printer matches key set for wireless router. The length or format of the Wi-Fi password and authentication method must be identical among the wireless router, the printer, and your computer. For details, see Setting an Encryption Key. With Encryption On, Cannot Communicate with Printer After Changing Encryption Type at Wireless Router If you change the encryption type for the printer and it subsequently cannot communicate with the computer, make sure the encryption type for the computer and the wireless router matches the type set for the printer. Cannot Communicate with Printer After Enabling MAC/IP Address Filtering or Encryption Key on Wireless Router 446