Canon PIXMA GM4040 Online Manual page 350

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Make sure security software's firewall is off.
Check9
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 the problem is not resolved, click here and redo setup.
350

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