SMTP -> ERROR: Failed to connect to server: A connection attempt failed
because the connected party did not properly respond after a period of time,
or established connection failed because connected host has failed to
respond. (10060)
SMTP Error: Could not connect to SMTP host. Message could not be sent.
Mailer Error: SMTP Error: Could not connect to SMTP host.

<?php
$mail->IsSMTP();
$mail->SMTPDebug = 2;
$mail->SMTPSecure = 'tls';
$mail->Host = "smtp.gmail.com";
$mail->SMTPAuth = true;
$mail->Username = "rammanoj.potla1608@gmail.com";
$mail->Password = "marjo741963";
$mail->port = 587;
$mail->From = "rammanoj.potla@gmail.com";
$mail->FromName = "rammanoj";
$mail->AddAddress("rammanojpotla1608@gmail.com", "ram");

$mail->WordWrap = 50;
$mail->IsHTML(true);

$mail->Subject = "Here is the subject";
$mail->Body    = "This is the HTML message body <b>in bold!</b>";
$mail->AltBody = "This is the body in plain text for non-HTML mail clients";

if(!$mail->Send())
{
echo "Message could not be sent. <p>";
echo "Mailer Error: " . $mail->ErrorInfo;
exit;
}

echo "Message has been sent";
?>