iPrint Appliance uses the following ports to access external applications:
636 and 389 - For LDAP Import and user authentication to the configured LDAP sources
80, 524, 443, 631, 636, and 389 - To access the source server for printer migration
5353 - To access the wireless network to advertise AirPrint printers
161, 515, and 9100 - To access printers