InManDis — Fortinet Troubleshooting Checklist
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1. Define exact symptom and scope.
2. Record start time and last known-good state.
3. Check CPU, memory, interfaces, HA/control plane.
4. Identify recent changes.
5. Validate physical/L2, then L3/routing.
6. Validate policy/session/NAT.
7. Check dependent services: DNS, authentication, certificates, FortiGuard, NTP.
8. Correlate logs with packet capture.
9. Use targeted debug; avoid uncontrolled broad debug in production.
10. Check release notes, known issues and compatibility.
11. Confirm EOL/EOS and hardware/software support.
12. Capture evidence before changing multiple variables.