php - imap_open failed in my server but works in local

$mailboxes =
            array(
                'label' => 'Mail',
                'mailbox' => '{mail.example.com:143/novalidate-cert}INBOX',
                'username' => "[email protected]",
                'password' => "mypassword"
           );

imap_open($mailboxes['mailbox'], $mailboxes['username'], $mailboxes['password'])
Copy code

I have caught this error when I useimap_last_error() :

"Connection failed to mail.example.com,143: Connection timed out"

But when I have tried it in localhost (Wampserveur), everything works fine.

Note:extension=php_imap.dll is enable on my serveur.