Syslog is a standard log transport mechanism that enables
the aggregation of log data from different network devices—such
as routers, firewalls, printers—from different vendors into a central
repository for archiving, analysis, and reporting. Palo Alto Networks
firewalls can forward every type of log they generate to an external
syslog server. You can use TCP or TLS (TLSv1.2 only) for reliable
and secure log forwarding, or UDP for non-secure forwarding.