Hi,
everything was working fine.
Then we needed to change the web GUI port from 443 to 8443, because of problems with HAProxy.
After a week, I noticed that I was not able to open the HA Status page.
After a long searching I found out, that I have to add :8443 to the
Synchronize Config to IP
IP address. Then it worked again, and I was able to update the slave configuration.
In my opinion there should be no dependency between the web GUI and the HA synchronization.
20.1.7 is in use.