Canon TS6400 Series Online Manual page 236

Make sure channel set on wireless router is a usable channel as confirmed in
Check7
the previous check.
If it is not, change the channel set on the wireless router.
Make sure security software's firewall is off.
Check8
If your security software's firewall is on, a message may appear warning you that Canon software is attempting
to access the network. If this warning message appears, set security software to always allow access.
If you are using any programs that switch between network environments, check their settings. Some
programs use a firewall by default.
If printer is connected to an AirPort Base Station via LAN, make sure you use
Check9
alphanumeric characters for network name (SSID). (macOS)
If the problem is not resolved, click here and redo setup.
• Positioning:
Make sure there are no obstacles between the printer and the wireless router.
Cannot Connect to a Printer through Wireless Direct
Check printer settings.
Check1
Select Device settings > LAN settings > Wireless Direct > Advanced mode in this order and enable it.
Check the settings of your device (smartphone/tablet).
Check2
Make sure Wi-Fi is enabled on your device.
For details, refer to your device's instruction manual.
Make sure printer is selected as connection for device (e.g. smartphone or
Check3
tablet).
Select the network name (SSID) for Wireless Direct specified for the printer as the connection destination for
devices.
Check the destination on your device.
For details, refer to your device's instruction manual or visit the manufacturer's website.
To check the network name (SSID) for Wireless Direct specified for the printer, display it using the operation
panel of the printer or print out the network setting information of the printer.
• Display on the LCD.
LAN settings
• Print the network settings.
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