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Interesting, but that makes sense. I never changed it from the default listen on all interfaces setting.

My NAT redirect rule still breaks it when applied on the backup device, so I had to change the way the rule works.

[LAN interface]

I was dealing with this issue after some changes I made last week. I finally narrowed it down to firewall rules... but not on the SYNC interface.

I'm using port forwarding for a transparent web proxy with NAT reflection turned on. That's all working. When I changed the rule to an inverse Hosts range (all addresses except those enumerated in the Alias) on the LAN interface, I lost my XMLRPC Sync. When I reverted, I got it back. Tested this twice. I have a separate rule on the SYNC interface to allow all.

Maybe I'm misunderstanding, but I assumed that NAT and firewall rules only apply on the interface specified in the rules, and that XMLRPC Sync is done on the interface selected in System -> Settings -> High Availability. But my LAN redirect rule broke my Sync.