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Use caution when using UDP to receive syslog messages because it is an unreliable protocol and as such there is no way to verify that a message was sent from a trusted syslog server.
As a best practice, always use SSL to listen for syslog messages when using agentless User Mapping on a firewall.
Syslog messages must meet certain criteria for a User-ID agent to parse them (see The PAN-OS integrated User-ID agent accepts syslogs over SSL and UDP only.Although you can restrict syslog messages to specific source IP addresses, an attacker can still spoof the IP address, potentially allowing the injection of unauthorized syslog messages into the firewall. In either case, make sure that the syslog server and client are both on a dedicated, secure VLAN to prevent untrusted hosts from sending syslogs to the User-ID agent.If You are using rsyslog instead of syslog, then you will need below change in rsyslog config.Router OS is capable of logging various system events and status information.Logs can be saved in routers memory (RAM), disk, file, sent by email or even sent to remote syslog server (RFC 3164).
System administrators use Syslog for network management and security auditing.