SMTP -> ERROR: Failed to connect to server: Network is unreachable (101)
SMTP Error: Could not connect to SMTP host. Mailer Error: SMTP Error:
Could not connect to SMTP host

$mail->IsSMTP();
$mail->SMTPDebug  = 1;
$mail->SMTPAuth   = true;
$mail->SMTPSecure = "ssl";
$mail->Host       = "smtp.gmail.com";
$mail->Port       = 465;
$mail->Username   = "xxxx@gmail.com";
$mail->Password   = "xxxx";

$mail->SMTPSecure = "tls"; // no luck

$mail->Host = "ssl://smtp.gmail.com"; // no luck

$mail->SMTPKeepAlive = true; // no luck

$mail->Port = 587; // no luck

$mail->Port = 25; // no luck