wp-mail reporting POP3 Error 13

My Yahoo email account is configured exactly correctly as confirmed by Yahoo and confirmed by using the same settings in Outlook. wp-mail.php is reporting “POP3 connect: Error [13] [Permission denied]”. I looked through the wp-mail.php code but was unable to debug it since I cannot determine where the “connect” function (class?) is located. Can anyone help or point me where to fine connect?

Code snippet referenced:

(!$pop3-><strong>connect</strong>(get_option('mailserver_url'),get_option('mailserver_port')))
	wp_die(wp_specialchars($pop3->ERROR));

Thanks,
Pete