It is no longer possible to start the upgraded server and have older, yet unupgraded proxies report data to a newer server.This approach, which was never recommended nor supported by Zabbix, now is officially disabled, as the server will ignore data from unupgraded proxies.
security.bsd.hardlink_check_gid=1security.bsd.hardlink_check_uid=1security.bsd.unprivileged_proc_debug=0security.bsd.see_other_gids=0security.bsd.see_other_uids=0security.bsd.unprivileged_read_msgbuf=0