Technical Tip: HTTP/HTTPS to FortiSwitch not working

Follow these steps if it is not possible to access the FortiSwitch GUI despite the correct configuration, such as allowing HTTP/HTTPS on the interface and successful pinging/SSH:

For FortiSwitch running v7.0.x:

config system global
    unset 802.1x-ca-certificate
    unset 802.1x-certificate
    unset admin-server-cert
end

config system global
    set 802.1x-ca-certificate "Fortinet_CA"
    set 802.1x-certificate "Fortinet_Factory"
    set admin-server-cert "Fortinet_Factory"
end

For FortiSwitch running v7.2.x:

config system global
    set 802.1x-ca-certificate "Fortinet_CA"
    set 802.1x-certificate "Fortinet_Factory"
end

config system web
    set gui-language english
    set https-server-cert " Fortinet_Factory"
end

config system web
    set gui-language english
    set https-server-cert " Fortinet_Factory"
end

Note:

Try upgrading FortiSwitch to version 7.2.5 and above, If it is not possible to access GUI intermittently:

https://docs.fortinet.com/document/fortiswitch/7.2.5/release-notes/255778/resolved-issues