SocketException: Host Lookup Failed

When a SocketException is thrown with the message "Host Lookup Failed", it means that the DNS lookup for the given hostname failed. This can occur for various reasons:

• The hostname is incorrect or does not exist.
• The DNS server is down or unreachable.
• The DNS configuration is incorrect.

To resolve this issue, try the following:

• Verify that the hostname is correct and exists.
• Check the DNS server configuration and ensure that it is up and running.
• Verify the DNS configuration on the computer to ensure it is correct.

Here is an example code snippet that could potentially throw this exception:

try {
    InetAddress address = InetAddress.getByName("invalid.hostname.com");
    Socket socket = new Socket(address, 80);
} catch (IOException e) {
    if (e instanceof SocketException) {
        String message = e.getMessage(); // Host Lookup Failed
        // handle the exception
    }
}

In this example, the getByName method is called with an invalid hostname, which causes the DNS lookup to fail and the SocketException to be thrown.

Overall, it's important to handle this exception properly in your code to prevent unexpected errors and improve the user experience.