YunServer with Http request(From iPhone)

Official Hardware Classic Yún
1

I use an app on iPhone to send http request(REST) to Yun to parse, everything works just fine on my machine. But won't work at all on my partners'. Here's the code:

Arduino:

.....

YunServer server;
YunClient client;

void setup() {
  // put your setup code here, to run once:
  Wire.begin();
  Bridge.begin();
  Serial.begin(9600);  
  server.noListenOnLocalhost();
  server.begin();
}

void loop() 
{
  // put your main code here, to run repeatedly:
  parseAppCmd();
  delay(50);
}

void parseAppCmd()
{
    client = server.accept();
    if (client)
    {
      Serial.println("Http request received, start parsing the request...");
      parseCmd(client);
      client.stop();
    }
}
...

The code above works fine on my machine, while on my partners' , even the message "Http request received, start parsing the request..." won't show up, let alone the subsequent parsing...
Anyone help me to figure out why?

2

If your machine works with code, then comment out all the "Serial." command .