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.
Article Id 202281
Description This article describes how to troubleshoot the RADIUS issue for SSL-VPN.
Scope FortiGate

SSL VPN tunnel mode is enabled in the firewall and the radius users are imported to the FortiGate.

So it is necessary to make sure the actual radius user name and the user imported in the Fortigate must be the same, if not we would get'  credential or ssl vpn configuration is wrong (-7200)' error.

Check the below-mentioned output.

# config user loca
    edit "test"   <----- Name of the user in firewall.
        set status enable
        set type radius

Since the username in firewall and radius is the same authentication is success and two factor worked.



Post entering the Token.It worked.


Now by mistake, if the radius user is saved with a different user name then VPN will not work.

# config user local
    edit "Test"  <----- The name from test to Test has been changed.
        set status enable
        set type radius

Trying to connect the VPN but it is not working.


it is because of the case sensitive, and post making the below mentioned changes the VPN is connected.

# config user local
    edit "Test"
        set status enable
        set type radius
        set username-case-sensitivity <----- To set username-case-sensitivity disable.