PHP IMAP not fetching records from cpanel roundcube inbox

Question

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Connection timed out when tried to fetch emails from the cpanel roundcube. All credentials are perfect and hostname and server also working fine.

$hostname = '{mail.server.com:993/novalidate-cert/imap/ssl}';
$username = 'username';
$password = 'password';

$stream = imap_open($hostname, $username, $password) or die('Cannot connect: ' . imap_last_error());
print_r(imap_errors());

Can anyone help please? Thank you