HP - Printers - Firewall ports

Based on an HP CM2320fxi MFP
To the printer:

1. http, tcp/80: web access.
2. https, tcp/443: secure web access.
3. tcp/9100: receiving print jobs.
4. snmp, udp/161: for auto-configuration of HP Universal Print Driver.

From the printer:

1. smtp, tcp/25: to mail server.
2. dns, udp/53: to DNS server (needed for scan to e-mail).