Why my board can't run the example WebClient?

Using Arduino Networking, Protocols, and Devices
#1

The board can run the WebServer but fails to run the WebClient.
In the WebClient, I have used either the DNS and no DNS methods and both can't work. It fails in this section:

if (client.connect(server, 80)) {
Serial.print("connected to ");
Serial.println(client.remoteIP());
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
}

#2

show the complete sketch

#3

In addition to the complete sketch (as Juraj already requested) you should tell us what hardware you’re using (link). And use code tags to post code (that’s the </> button in the editor)!

#4