HAProxy does not sync settings to secondary fpSense

[planetinse]

HAProxy does not sync changes to secondary pfSense server
all other things sync fine - any ideas on troubleshooting?

1.8.25
2.4.5-RELEASE-p1
FreeBSD 11.3-STABLE

Sync HAProxy configuration to backup CARP members via XMLRPC.
is checked, tried to uncheck and check back as a stupid thing..

one thing that can be a lead on this issue is constant notifications of:

A communications error occurred while attempting to call XMLRPC method host_firmware_version:

[planetinse]

This magically resolved itself, by adding both 443 and port 444 on the SYNC network,