Can't connect to cloud using web api ,don't know wy

I have connected a core to the cloud, I used jquery to give a command control, the access_token is good and device id is right as well.

            var port = "D3", value = "LOW";
            $.ajax({
              type: "POST",
              url: "https://api.particle.io/v1/devices/"+id+"/digitalwrite",
              data: { access_token: "64f621ce78b20296af6195903e47f59550d3f254", args: port+","+value },
              success: function(){
              },
              dataType: "json"
            }).fail(function(obj) {
            });

i used this code above yesterday, works well. However, just tonight it just didn’t work, give me a error saying:

POST https://api.particle.io/v1/devices/54ff70066667515129371467/digitalwrite net::ERR_NAME_NOT_RESOLVED

Any thoughts?

Did you flash a new firmware that is not tinker?