If you experience a 6901 or 6910 error on your iB4120, disabling IPv6 may help resolve the problem.
Solution
If your MAXIFY printer is not detected by any wireless devices after it has been connected to a wireless LAN, disabling IPv6 on the printer may correct the issue. Follow the steps below to disable IPv6.
Press the Setup button.
In the Setup menu, press the right arrow to select Device settings. Press OK.
In Device settings, press the right arrow to select LAN settings. Press OK.
InLAN settings, press the right arrow to select Other settings. Press OK.
InOther settings, TCP/IP settings will be the first option. Press OK.
A message will scroll across the screen. The message states: LAN communication may be disabled. Press [OK] to continue. Press OK.
Enable / disable IPv6 will appear on the screen. By default, Active will be selected. Press the right arrow to select Inactive. Press OK.