Canon PRO-300 Series Online Manual page 446

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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

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