Canon imageCLASS LBP121dn User Manual page 322

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To Disable MAC Address Filter
[Home] screen on the operation panel
[Firewall Settings]
[Off]
Restart the machine.
2
Configure the firewall correctly.
Reinstall the Printer Driver.
Uninstall the installed driver, and then reinstall it.
For details about uninstalling and installing drivers, see the driver manual at the online manual site.
https://oip.manual.canon/
Are You Using Resident Software?
If you are using resident software, such as security software, disable it and then try printing.
Can You Print from Another Computer in the Network?
If you cannot print from another computer, contact your dealer or service representative.
Persists(P. 339)
Troubleshooting
[Menu]
[MAC Address Filter]
Setting the Firewall(P. 147)
315
[Preferences]
[Network]
[Outbound Filter] or [Inbound Filter]
If the Problem

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