The Printer Cannot Be Accessed from the Remote UI or Network Related Utility Software

<Cause> The IP Address Filter or MAC Address Filter is set to On.

Solution

Select [Network] → [Address Filter] using the control panel, and then make sure that [Address Filter] is set to [Off]. "[Setup] Menu ([Network] Options)" If you have once set it to [Off], set it back to [On] after confirmation of the setting. Use the control panel to make a setting for the address filter function.