Canon Pixma MX520 Series Online Manual page 155

Normally, select Auto. If you want to specify the method manually, select Open System or Shared Key
according to the setting of the access point.
7. Click OK.
Important
If the printer cannot communicate with the computer after the encryption type of the printer was switched, make
sure that encryption types for the computer and the access point matches that set to the printer.
Note
Changing the network settings with the USB cable temporarily may switch the default printer. In this case, reset
Set as Default Printer.
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