HOW TO CONFIGURE SYSLOG SERVER ON FORTIGATE 5.0.7

Server # config log syslogd setting
Server (setting) # set status enable (enable logging to a remote syslog server).
Server (setting) # set facility local0  (identifies the source of the log message to syslog).
Server (setting) # set server  (the IP address of the syslog server).
Server (setting) # end