The following PAM 3.3.x documentation have some bugs regarding the ports being used by PAMCluster Deployment Requirements IP Addresses and Ports for Network Connectivity
In both documents, the documentation about ports 7900, 7901 and 7902 is obsolete for versions 3.3.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 Open13397 TCP Open