Canon imageCLASS MF266dn II User Manual page 647

IEEE 802.1X error. The auth. server cert. has expired.
The server certificate sent from the RADIUS server has expired.
Check the Expiry Date of the RADIUS Server.
Setting IEEE 802.1X(P. 361)
IEEE 802.1X error. The auth. server cert. is incorrect.
A CA certificate that supports the certificate of the authentication server is not registered to the machine.
Check the Certificate Information of the Authentication Server, and Register a Supported CA
Certificate.
Setting IEEE 802.1X(P. 361)
Registering a Key and Certificate or CA Certificate Obtained from an Issuing Authority(P. 369)
Incorrect number of characters/invalid characters entered.
The network key of the wireless LAN router (access point) is not configured correctly on the machine.
Reset the Network Key.
Check the network key of the wireless LAN router, and configure the settings correctly on the machine.
Connecting to a Wireless LAN(P. 59)
Insert the drum cartridge.
The drum cartridge is not installed correctly.
Reinstall the Drum Cartridge.
Replacing the Drum Cartridge(P. 536)
If the message still appears after repeatedly reinstalling the drum cartridge, contact your dealer or service
representative.
Insert the toner cartridge.
The toner cartridge is not installed correctly.
Reinstall the Toner Cartridge.
Replacing the Toner Cartridge(P. 532)
If the message still appears after repeatedly reinstalling the toner cartridge, contact your dealer or service
representative.
Memory is full.
[Memory is full.] Is Displayed on the Control Panel, and the Operation Cannot Be Performed.
Scanning or faxing cannot be performed due to insufficient available memory. If there is data waiting to be printed or
sent, wait until the processing is completed.
Check the Received Faxes Saved in the Memory.
Print or forward them as needed, and delete any unnecessary faxes.
the Memory(P. 382)
When Scanning, Change the Data Size to a Small File Format.
Troubleshooting
If the Problem Persists(P. 651)
If the Problem Persists(P. 651)
Viewing and Printing Faxes Saved in
638