Canon PRO-100S series Online Manual page 448

The wireless router is located indoors within the effective range for wireless communication. Locate the printer
within 164 ft. / 50 m from the wireless router.
Make sure that there is no source of radio wave interference in your vicinity.
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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 wireless router 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).
Confirm the TCP/IP setting of the printer and disable IPv6.
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To check the current TCP/IP setting, print out the network setting information.
Printing Out Network Setting Information
When "TCP/IP Version" is set to "IPv4 & IPv6", both IPv4 and IPv6 are enabled.
Press and hold the RESUME/CANCEL button, then release the button when the POWER lamp flashes 17 times.
IPv6 is disabled and only IPv4 is enabled.
If the problem is not resolved, perform setup again with the Setup CD-ROM or perform it according to the
instructions on our website.
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