sending data from arduino ethernet sheild to mysql on server

Hi guys,i'm having a trouble with my arduino ethernet while sending data to mysql on server . in the serial inform connection failed .can you help me to solving this trouble =( .thanks alots

/**

*/
#include "SPI.h"
#include "Ethernet.h"
#include "sha1.h"
#include "mysql.h"

/* Setup for Ethernet Library */
byte mac_addr[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress server_addr(31, 170, 164, 30); //server 
/* Setup for the Connector/Arduino */
Connector my_conn; // The Connector/Arduino reference

char user[] = "u925539565_dktb"; // here is mysql account
char password[] = "thehieu"; 
char INSERT_SQL[] = 
 "UPDATE  u925539565_dktb.TB SET  TT =0 WHERE  TB.STT =1 AND  TB.TT =1;";

void setup() {
  Ethernet.begin(mac_addr);
  Serial.begin(115200);
  delay(1000);
  Serial.println("Connecting...");
  if (my_conn.mysql_connect(server_addr, 3306, user, password))
  {
    delay(500);
     /* Write Hello, World to MySQL table test_arduino.hello */
     my_conn.cmd_query(INSERT_SQL);
     Serial.println("Query Success!"); 
  } 
  else
    Serial.println("Connection failed.");
}

void loop() {
}