unable to retrieve DDNS server information from the FortiGuard Service.

遠端登入fortigate設備, 或是使用GUI右上角的 >_ cli console 執行以下指令

方式一(2021/08/18適用v6.0.12):
config system fortiguard
set ddns-server-ip 173.243.138.225
end

方式二:
config system fortiguard
set fortiguard-anycast disable
set protocol udp
end