Non-standard Tracker V10 listener ports

List iptables with line numbers:

iptables -L --line-numbers

Insert a policy just before the REJECT all policy in the VPM-Firewall-INPUT chain.  In this example, the REJECT all policy has line number 7:

iptables -I VPM-Firewall-INPUT 7 -p udp --dport 5620 -j ACCEPT

Save the new policy:

service iptables save