UDP port 730 unreachable

I set up HA between 2 FortiGate VMs on vSphere. When I do a packet sniff on the heartbeat interface of FW1b I am getting ICMP unreachables for port 730 from FW1a. Both are configured identical. Any idea where to troubleshoot next?

FW1a:

bb-fortigate-1a # sho system interface port5 config system interface     edit "port5"         set ip 192.168.255.1 255.255.255.0         set allowaccess ping https ssh snmp http telnet         set type physical         set snmp-index 5     next end  bb-fortigate-1a # sho system ha config system ha     set group-id 1     set group-name "site1cluster"     set mode a-p     set hbdev "port5" 0      set session-pickup enable     set ha-mgmt-status enable     config ha-mgmt-interfaces         edit 1             set interface "port1"             set gateway 172.20.137.65         next     end     set override disable     set priority 200     set unicast-hb enable     set unicast-hb-peerip 192.168.255.2 end

FW1b:

bb-fortigate-1b # show system interface port5 config system interface     edit "port5"         set ip 192.168.255.2 255.255.255.0         set allowaccess ping https ssh snmp http telnet         set type physical         set snmp-index 5     next end  bb-fortigate-1b # sho system ha config system ha     set group-id 1     set group-name "site1cluster"     set mode a-p     set hbdev "port5" 0      set session-pickup enable     set ha-mgmt-status enable     config ha-mgmt-interfaces         edit 1             set interface "port1"             set gateway 172.20.137.65         next     end     set override disable     set priority 150     set unicast-hb enable     set unicast-hb-peerip 192.168.255.1 end

bb-fortigate-1b # diag sniffer packet port5 Using Original Sniffing Mode interfaces=[port5] filters=[none] 0.110524 192.168.255.2.730 -> 192.168.255.1.730: udp 451 0.110915 192.168.255.1 -> 192.168.255.2: icmp: 192.168.255.1 udp port 730 unreachable 0.312181 192.168.255.2.730 -> 192.168.255.1.730: udp 451 0.513945 192.168.255.2.730 -> 192.168.255.1.730: udp 451 0.715994 192.168.255.2.730 -> 192.168.255.1.730: udp 451 0.918014 192.168.255.2.730 -> 192.168.255.1.730: udp 451 1.119998 192.168.255.2.730 -> 192.168.255.1.730: udp 451 1.120424 192.168.255.1 -> 192.168.255.2: icmp: 192.168.255.1 udp port 730 unreachable 1.321997 192.168.255.2.730 -> 192.168.255.1.730: udp 451 1.523655 192.168.255.2.730 -> 192.168.255.1.730: udp 451 1.725652 192.168.255.2.730 -> 192.168.255.1.730: udp 451 1.927529 192.168.255.2.730 -> 192.168.255.1.730: udp 451

On FW1a I get this which is weird since FW1a is clearing responding to FW1b already:

bb-fortigate-1a # diag sniffer packet port5 Using Original Sniffing Mode interfaces=[port5] filters=[none] 1.012814 arp who-has 192.168.255.2 tell 192.168.255.1 2.139286 arp who-has 192.168.255.2 tell 192.168.255.1 3.172803 arp who-has 192.168.255.2 tell 192.168.255.1