Some of the ports that the PAM 3.3 documentation mentions as used by the PAM cluster are shown as filtered or closed when scanning them. Concretely, when trying to scan them from a cluster node to another cluster node, having the cluster on, the following results are shown:
In both documents, the documentation about ports 7900, 7901 and 7902 is obsolete for versions 3.3. They are no longer used. In the first document it shows that port 3306 should be OPEN and this is no longer true in versions 3.3.
So, the correct information for the ports being used by PAM cluster is:
123 UDP Open 443 TCP Open 3307 TCP Open 5900 TCP Open 8443 TCP Open 13307 TCP Open
The port 123 UDP corresponds to the NTP (Network Time Protocol) Servers and it has not been scanned from the appliance because it will always appear as CLOSED as the appliances just perform TCP port scanning and not UDP port scanning.