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.