The default ports used by the Security Server hosted on Ubuntu can be found at:

https://github.com/nordic-institute/X-Road/blob/develop/doc/Manuals/ig-ss_x-road_v6_security_server_installation_guide.md#221-network-diagram

The default ports used by the Security Server hosted on Red Hat Enterprise Linux (RHEL) can be found at:

https://github.com/nordic-institute/X-Road/blob/develop/doc/Manuals/ig-ss_x-road_v6_security_server_installation_guide_for_rhel7.md#221-network-diagram