The following table is intended to help you diagnose common problems and provides links to the corresponding troubleshooting topics:
|Checking the hardware connections
|FortiOS network settings
|Checking FortiOS network settings
|CPU and memory resources
|Checking CPU and memory resources
|Checking the modem status
|Ping and traceroute
|Is the FortiGate experiencing complete packet loss?
|Running ping and traceroute
|Do you need to identify a problem?
|Checking the logs
|Contents of the routing table (in NAT mode)
|Verifying routing table contents in NAT mode
|Is the traffic routed correctly?
|Verifying the correct route is being used
|Is the correct firewall policy applied to the expected traffic?
|Verifying the correct firewall policy is being used
|Bridging information in transparent mode
|Are you having problems in transparent mode?
|Checking the bridging information in transparent mode
|Firewall session list
|Using a session table
|Is the wireless network working properly?
|Checking wireless information
|Is the FortiGate communicating properly with FortiGuard?
|Verifying connectivity to FortiGuard
|Performing a sniffer trace (CLI and packet capture)
|Is traffic entering or leaving the FortiGate as expected?
|Debugging the packet flow