Technical Tip: How to access GUI after upgrading the firmware

1. Verify that the HTTPS is enabled:

config system interface

    set allowaccess ping https

2. Confirm that the trusted is not configured if its there then try to access it from there only.
   
   config system admin
       set trusthost1 0.0.0.0 0.0.0.0

3. Verify the HTTPS port configured on system global settings.
   
   show full | grep admin-sport
   
   

Then, access the FortiGate via a specific port number https://<IPaddress of FortiGate>:<custom port>. For example, https://192.168.0.253:8443 where 8443 is the non-default port used for https.

4. Look for the HTTPSD process through 'Fnsysctl ps' if its there or not. Try to kill it through the below command, an error will appear:

fnsysctl killall httpsd

killall: httpsd: no process killed

5. Verify the global system setting for the admin server, if the cert is not selected then select the proper cert for the same.

    

config system global

    set admin-server-cert ''" <----- Select self-sign.

Try to access the unit, if the issue is still there create a ticket through the Fortinet support portal.

Note:

Super Admin privilege is required to run 'fnsysctl' command. Otherwise, FortiGate will return an error as mentioned in this article: Technical Tip: fnsysctl command returns Unknown action 0