Login MFD's web interface as administrator

Navigate to the Network tab

Continue to IPP Setting

Change the settings as shown below:

Enable IPP Setting option

Enable Accept IPP job option

Navigate to the Security tab

Continue to PKI Settings > Device Certificate Setting

Use the New Registration button

Select the Request a Certificate option > OK

Insert details of your organization > OK

A message: Certificate Request was successful is displayed > OK

Copy or Save a Certificate Signing Request Data and submit them to your certification authority

Create a certificate with your certification authority

Continue on Security tab > PKI Settings > Device Certificate Setting

Select your Requesting Certificate and press the Setting button

Use Install a Certificate option > OK

Add certificate from your certification authority (the certificate you have created in step 8) > Press the Install button

A message with the result of installation will be displayed

Continue to PKI Settings > SSL Setting

Set Mode using SSL/TLS to Admin. Mode and User Mode

Set Encryption Strength to encryption which you use (if you are not sure which encryption use, set attribute to AES-256, 3DES-168, RC4-128, DES-56, RC4-40)