Canon mp495 - Manual (Page 741)

possible.
Check 10: Make sure that the network settings of the computer are correct.
Make sure that the computer can communicate with the printer and the access point over the
wireless LAN.
Check 11: Make sure that Enable bidirectional support is selected in the Ports
sheet of the properties dialog box of the printer driver.
Opening the Printer Driver Setup Window
Check 12: Make sure that the firewall of the security software is disabled.
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.
Check 13: When using a router, connect the printer and computer to the LAN
side (same network segment).
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Page 741 of 759 pages Cannot Communicate With the Machine/Cannot Print from the Machine