I think the only way to get encrypted sending with the UTM is to send the traffic through a site-to-site VPN. Or, is your goal to encrypt the logfile in the UTM and then to have it stored encrypted on the remote syslog server?
Hi, my goal is to send the encrypted log files to the Remote Syslog server. I can configure this for example on my Cisco ASA, Ubuntu, Synology NAS and other devices. TLS (SSL) Encrypting syslog
But it seems that the Sophos UTM doesn't support this feature. I will do a Suggestion!!!