Step 1 – Add the external log server
Go to Manage > System > Advanced Settings and locate Syslog.global.logHost and edit settings.
Add the following: udp://SERVER.domain.com:514
Step 2 – Configure Firewall rules to allow access to external syslog server.
Go to Host > Networking > Firewall Rules and locate syslog and edit settings:
Select Only allow connections from the following networks and enter the external syslog server.