Canon i-SENSYS MF6140dn User Manual page 890

If the machine's power is turned OFF and ON it is because a new IP address has been assigned.
When using DHCP, consult your network administrator and perform one of the following:
Setting the DNS Dynamic Update function
"Setting IPv4 DNS"
Setting the machine so that it uses the same IP address every time it starts up
The printer port name is not displayed in [Print to the following port(s)]
Make sure that the correct printer driver is installed to your computer.
When switched to wireless LAN connection from the other method (USB connection or wired LAN connection), uninstall
the MF driver.
Once uninstallation is complete, reinstall the MF driver.
"MF Driver Installation Guide"
Check the printer folder to make sure that the printing destination of the computer is set to the machine.
The machine automatically connects to the wrong destination via the dial-up connection
(when using a dial-up router)
If the broadcast does not need to traverse the dial-up router, configure the dial-up router so that the broadcast does not
traverse it. If the broadcast needs to traverse the dial-up router, run a check the dial-up router settings.
When a DNS server exists in the external network, specify the destination IP address instead of the host name. This also
applies when the device to which you want to connect the machine and the machine exist on the same network.
When a DNS server and the machine exist on the same network and the device registered on the DNS server exists in
the external network, run a check the settings.
When security settings on the wireless LAN router/access point are changed
Certain settings on the wireless LAN router or access point will not allow connection/communication with the machine.
Connection/communication with the machine is not possible under the following settings.
For information on wireless LAN router or access point settings, refer to the instruction manual of the wireless
LAN router or access point, or contact the manufacturer.
The machine is not able to find the wireless LAN router/access point for the following
Stealth function: Enabled
- A function that prevents a wireless LAN router or access point from displaying its SSID on other devices.
To connect without disabling the stealth function, enter the settings manually.
"Setting by Manually Entering SSID"
Deny ANY: Enabled
- A function on a wireless LAN router or access point that denies connection with a device whose SSID is set to
"Any" or is left empty.
To connect without disabling Deny ANY, enter the settings manually.
"Setting by Manually Entering SSID"
The machine cannot connect with the wireless LAN router/access point
MAC address filtering: The MAC addresses of the machine or certain computers are denied access.
- A function on the wireless LAN router or access point that denies communication with all devices other than those
whose MAC addresses (a unique identifier number given to each device) are registered in the wireless LAN router
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