For this, you need to configure your firewall to forward the syslog log to the Wazuh Manager. And then configure the Manager to receive these logs with a block similar to this in the ossec.conf file:
<ossec_config>
<remote>
<connection>syslog</connection>
<port>513</port>
<protocol>tcp</protocol>
<allowed-ips>192.168.2.0/24</allowed-ips>
</remote>
</ossec_config> You can find an example of this configuration in the
provided link. And you can check this other reference documentation for more information on the configuration parameters:
https://documentation.wazuh.com/current/user-manual/reference/ossec-conf/remote.htmlWazuh comes ready with decoders and rules for processing Fortigate logs, so that is all you should need to do to start processing your logs.