Canon iX6800 series Online Manual page 362

If a device (e.g. microwave oven) using the same frequency bandwidth as the wireless station is placed nearby,
the device may cause interference. Place the wireless station as far away from the interference source as
possible.
Make sure that the network settings of the computer are correct.
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Make sure that the computer can communicate with the printer and the access point over the wireless LAN.
Make sure that Enable bidirectional support is selected in the Ports sheet of
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the properties dialog box of the printer driver.
Make sure that the firewall of the security software is disabled.
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If the firewall function of your security software is turned on, a message may appear warning that Canon
software is attempting to access the network. If the warning message appears, set the security software to
always allow access.
If using any programs that switch the network environment, check their settings. Some programs will enable a
firewall by default.
When using a router, connect the printer and computer to the LAN side (same
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network segment).
If the problem is not resolved, perform setup with the Setup CD-ROM or perform it according to the
instructions on our website.
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