The general troubleshooting tips include, and can help answer the following questions.

 

Are all the cables and interfaces connected properly?

Is the LED for the interface green?

 

If you are having problems connecting to the management interface, is your protocol enabled on the interface for administrative access?

Is there an IP address on the interface?

 

Is your CPU running at almost 100 percent usage?

Are you running low on memory?

 

Is the modem connected?

Are there PPP issues?

 

Are you experiencing complete packet loss?

 

Do you need to identify a problem?

 

Are there routes in the routing table for default and static routes?

Do all connected subnets have a route in the routing table?

Does a route wrongly have a higher priority than it should?

 

Has the traffic been routed correctly?

 

 

Is the correct firewall policy applied to the expected traffic?

 

Are you having problems in Transparent mode?

 

Have you reached the maximum number of sessions for a protocol?

Are new sessions failing to start for a certain protocol?

 

Are there active firewall sessions?

 

Is the wireless network functioning properly?

 

Is the FortiGate unit communicating properly with FortiGuard?

 

Is traffic entering the FortiGate unit and does it arrive on the expected interface?

Is the ARP resolution correct for the next-hop destination?

Is the traffic exiting the FortiGate unit to the destination as expected?

Is the traffic being sent back to the originator?

 

Is the traffic entering or leaving the FortiGate unit as expected?