You can delete an imported certificate when the certificate has expired or when an encrypted connection is no longer necessary.
If you obtain a certificate using a CSR created from Web Config, you cannot import a deleted certificate again. In this case, create a CSR and obtain a certificate again.
Enter the printer's IP address into a browser to access Web Config.
Enter the printer's IP address from a computer that is connected to the same network as the printer.
You can check the IP address of the printer from the following menu.
Settings > General Settings > Network Settings > Network Status > Wired LAN/Wi-Fi Status
Enter the administrator password to log in as an administrator.
Select in the following order.
Network Security tab.
Select one of the following.
Click Delete.
Confirm that you want to delete the certificate in the message displayed.