HA-Sync error after Update to 20.7.7(_1)

[bitmusician]

Hello,

I'm testing the update 20.7.7(_1) on a two node OPNsense HA-Cluster and everytime I want to sync the config from Master to Backup I get the following error: "An error occurred while attempting XMLRPC sync with username test and https://192.168.x.x/xmlrpc.php parse error. not well formed"
The changes I made on the Master node didn't affect the GUI of the Backup Node (for example: new alias, new firewall rule,...) but after a checksum test of the config.xml (md5 /usr/local/etc/config.xml) and ipsec config file (md5 /usr/local/etc/ipsec.conf) on both nodes the checksums were equal as they should be.

Am I checking the wrong files or is there a problem with applying the config to the GUI?

PS: Except for updating the nodes I didn't change anything in the configuration of "High Availability".

Greetz,
bitmusician

[marcquark]

known issue https://github.com/opnsense/core/issues/4533