Learn how to generate a server certificate on the MAXIFY GX4020 in order to use it with an SSL connection on an IPv6 network.
Solution
When you use SSL connection via IPv6 network, you need to generate an IPv6 server certificate using the printer.
Generate the server certificate from Remote UI.
Follow the procedure below.
If you generate a server certificate, a warning message may appear if you are using Remote UI.
To reset the server certificate, select Security -> SSL/TLS settings -> Delete key and certificate in this order, and select OK on the displayed screen.
If you specify the administrator password, enter the password.
Select Security.
Select SSL/TLS settings.
Select Generate key and certificate.
Select Generate self-signed cert.
The Generate self-signed cert screen appears.
Specify each setting item.
Signature algorithm
Select SHA256.
Public key length (bits)
Select 2048 bits.
Specify the expiration date.
Enter the date you generated the server certificate on Valid from.
Enter the date the server certificate expires on Valid to.
Enter the common name.
Enter the value in Common name you checked and wrote down on "3-2-16".
When you enter the common name, add [ ] to each end of the printer's IP address.
Do not use a comma or make a space for the common name.
Select Next.
You need not enter anything on Country, State or province, Locality, Organization, Organizational unit, or Subject Alternative Names.
Select Generate.
The server certificate starts to be generated.
When the server certificate has been generated, Generated a self-signed certificate. appears.
Select Restart LAN.
The network connection of the printer will be restarted.
When the connection has been restarted, Printer status in the Remote UI appears.
If you cannot access to Remote UI after you restart LAN, reload your web browser.
Select Security in the Remote UI.
Select SSL/TLS settings.
The SSL/TLS settings screen appears.
Select Check key and certificate.
The Check key and certificate screen appears.
Make sure the issuer of the root certificate is displayed on Issued by, and the value you entered on Common name on Subject.
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If you generate a server certificate, a warning message may appear if you are using 
