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      Unable to access WebUI (HTTPS) after upgraded to FortiOS 7.2.5

      This article describes that Starting from FortiOS 7.2.5, the SHA-1 certificate has been removed for the web management interface (GUI).

      Change the built-in Fortinet_GUI_Server certificate or SHA-256 and higher certificates for the web management interface. Do this via PUTTY

       

      For example:

       

      config system global
          set admin-server-cert Fortinet_GUI_Server
      end

       

      Related document:

      https://docs.fortinet.com/document/fortigate/7.2.5/fortios-release-notes/681556/remove-support-for-sha-1-certificate-used-for-web-management-interface-gui