Problem – Determine why 192.168.1.10, is unable to reach 172.16.1.10 on TCP 25 as Fortigate and server firewall rules are configured properly to allow this traffic. In this example I assume you only know how to SSH into your firewall and that you know which VDOM the source or destination is in which you want to troubleshoot… I’ve changed the IPs, vlans, vlinks, and VDOMs involved to obfuscate the data, but it should still prove to be a good example for you. We had such a case recently, and I wrote this up for documentation, sharing is caring :). With a complex rule-set, including multiple VDOMs, there are times where we need to figure out why some traffic (source) is not reaching its destination. In one of my work environments we use Fortigate firewalls.
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