MQTT is not working in an specific wifi network

Projects Programming
3

Here is the part of the code corresponding to wifi and mqtt:

const char* ssid = "as";
const char password = "vD";
const char username = "";
const char mqttServer = "t****.s***.pt";
unsigned int mqttPort = 1883;
const char* mqttUser = "";
const char* mqttPassword = "";

WiFiClient espClient;
PubSubClient client(espClient);

DFRobotHCHOSensor hcho(SensorAnalogPin,VREF);

void setup() {

Wire.begin();
Serial.begin(115200);
client.setKeepAlive(360);
WiFi.begin(ssid, password);

while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.println("Connecting to WiFi..");
}

Serial.println("Connected to the WiFi network");
Serial.println(WiFi.localIP());

client.setServer(mqttServer, mqttPort);

while (!client.connected()) {
Serial.println("Connecting to MQTT...");

if (client.connect("***", mqttUser, mqttPassword )) {

  Serial.println("connected");

} else {

  Serial.print("failed with state ");
  Serial.println(client.state());
  delay(2000);

}

}

And this is the result:

state -2