pfSense

Cloned from:
https://forum.netgate.com/topic/131916/pfsense-with-ha-closing-sessions-when-apply-any-rule

On XG-7100,
- sync interface ping, port 443 is open, ...
- xmlrpc works (the config sync does work at stage #1)
- xmlrpc errors are shown after a while (restore_config_section and host_firmware_version are shown as failed)
- sessions get closed on apply any change in the modification

Please note that only once the apply button has been pressed, and 2 "Syncing firewall" has been logged in 2 seconds span.

Logs from master:
Apr 29 01:48:44 pf1-lipi check_reload_status: Syncing firewall
Apr 29 01:48:45 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: Beginning XMLRPC sync data to https://10.11.8.232:443/xmlrpc.php.
Apr 29 01:48:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: XMLRPC reload data success with https://10.11.8.232:443/xmlrpc.php (pfsense.host_firmware_version).
Apr 29 01:48:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: XMLRPC versioncheck: 18.9 -- 18.9
Apr 29 01:48:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: Beginning XMLRPC sync data to https://10.11.8.232:443/xmlrpc.php.
Apr 29 01:48:46 pf1-lipi check_reload_status: Syncing firewall
Apr 29 01:48:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: Beginning XMLRPC sync data to https://10.11.8.232:443/xmlrpc.php.
Apr 29 01:48:57 pf1-lipi check_reload_status: Reloading filter
Apr 29 01:49:25 pf1-lipi sshd⁵¹⁷⁹¹: user admin login class [preauth]
Apr 29 01:49:25 pf1-lipi sshd⁵¹⁷⁹¹: user admin login class [preauth]
Apr 29 01:49:25 pf1-lipi sshd⁵¹⁷⁹¹: user admin login class [preauth]
[login as my session get disconnected]
Apr 29 01:49:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: A communications error occurred while attempting to call XMLRPC method restore_config_section:
Apr 29 01:49:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: New alert found: A communications error occurred while attempting to call XMLRPC method restore_config_section:
Apr 29 01:49:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: Beginning XMLRPC sync data to https://10.11.8.232:443/xmlrpc.php.
Apr 29 01:49:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: A communications error occurred while attempting to call XMLRPC method host_firmware_version:
Apr 29 01:49:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: New alert found: A communications error occurred while attempting to call XMLRPC method host_firmware_version:
Apr 29 01:49:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: Beginning XMLRPC sync data to https://10.11.8.232:443/xmlrpc.php.
Apr 29 01:50:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: A communications error occurred while attempting to call XMLRPC method restore_config_section:
Apr 29 01:50:46 pf1-lipi php-fpm³⁴⁸: /rc.filter_synchronize: New alert found: A communications error occurred while attempting to call XMLRPC method restore_config_section:
Apr 29 01:50:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: A communications error occurred while attempting to call XMLRPC method host_firmware_version:
Apr 29 01:50:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: New alert found: A communications error occurred while attempting to call XMLRPC method host_firmware_version:
Apr 29 01:50:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: XMLRPC versioncheck: -- 18.9
Apr 29 01:50:47 pf1-lipi php-fpm⁵⁵⁴²: /rc.filter_synchronize: The pfSense software configuration version of the other member could not be determined. Skipping synchronization to avoid causing a problem!

How to reproduce:
1) setup a cluster in HA
2) apply any configuration change (even disable one rule and enable it again, then press apply)
3) errors are shown both in UI and logs