IoT Server not communicate with ESP8266

lincikg wrote: Hello
I playing with "DS18B20_temperature_sensor.ino" sample, and I do not understand what's wrong:
then my node starts in serial port I see next:
AP.
WiFi connected
192.168.20.100
Temperature: 23.56
connection failed
Connecting to AP...
WiFi connected
192.168.20.100
connection failed
...............
192.168.20.100 is node ip, usig port 80, IoT server ip 192.168.20.253
I do not understand what's wrong in line

while(!client.connect(EIOT_IP_ADDRESS, EIOT_PORT)) {
Serial.println("connection failed");
wifiConnect();
}

of sendTeperature() funtion
It seems that the server is not responding, Why??? (#define EIOT_IP_ADDRESS "192.168.20.253" #define EIOT_PORT 80)
Using EasyIoT v8.0 for Windows, I tried to open port 80 on Windows, but still the same....
Please help...