FortiGate
FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
Besi5
Staff
Staff
Article Id 393567
Description This article describes how to fix the issue when Root FortiGate cannot authorize downstream FortiGate after upgrade. 
Scope FortiOS 7.2.6 and above.
Solution

Scenario 1: When 'set index x' is missing from the config trusted-list.

 

config sys csf

    config trusted-list
        show
        path=, objname=trusted-list, tablename=(null), size=408
            config trusted-list
                edit "FG200ETK199XXXX"
                    set serial "FG200ETK199XXX"

                    ....   ----> The issue here.

                next

end

Solution: Manually configure the setting 'set index x', where x should be a number >0.

 

Scenario 2: When setting 'set index' is set to 0 in the trusted-list.

 

config sys csf

    config trusted-list
        show

            edit "FG200ETK199YYYYY"
                set serial "FG200ETK199YYYYY"

                set index 0 ----> The issue here.

            next

            edit "FG200ETK199ZZZZZ"
                set serial "FG200ETK199ZZZZZ"

                set index 1 

            next
end

 

Solution: When the setting is set to 0, configure it manually to a different number (for example, 2).

 

After adding 'set index' or changing the value from 0 to another number, Root FortiGate should be able to authorize downstream firewalls. 

Note: The feature 'set index' is used to assign a specific position to a downstream FortiGate in a CSF-managed trust tree, helping maintain structured communication and control in distributed setups, which is introduced in FortiOS version 7.2.6 and continued in later versions.