OpenSSL error when trying to establish a connection

[ben1985614]

Hello,

We see the following error in the PHP log during establishing a connection:

[22-May-2025 13:35:03 Europe/Berlin] PHP Warning:  stream_socket_client(): SSL operation failed with code 1. OpenSSL Error messages:
error:0A00010B:SSL routines::wrong version number in C:\phpimap\vendor\webklex\php-imap\src\Connection\Protocols\Protocol.php on line 244
[22-May-2025 13:35:03 Europe/Berlin] PHP Warning:  stream_socket_client(): Failed to enable crypto in C:\phpimap\vendor\webklex\php-imap\src\Connection\Protocols\Protocol.php on line 244
[22-May-2025 13:35:03 Europe/Berlin] PHP Warning:  stream_socket_client(): Unable to connect to tls://xxxxxx.goserver.host:587 (Unknown error) in C:\phpimap\vendor\webklex\php-imap\src\Connection\Protocols\Protocol.php on line 244

Here is our PHP code:

$imapClientManager = new ClientManager($options = []);
$imapClient = $imapClientManager->account('xxxxxxxx');

$vpIMAPClient = $imapClientManager->make([
	'host'          => 'xxxxxx.goserver.host',
	'port'          => 587,
	'encryption'    => 'tls',
	'validate_cert' => false,
	'username'      => 'xxxxxx@xxxxxx.xx',
	'password'      => 'xxxxxxx',
	'protocol'      => 'imap'
]);

try {
	$imapClient->connect();
} catch (Exception $e) {
	print_r($e);
}

We're using OpenSSL 3.5.0.

Can you please tell us what's causing this problem?