isConnected() returning true, ignoring the credentials

[Norgul]

Having the following code:

$client = new Client($connectionWrapper->connection);
$client->setLogin($username, $password);

$connected = $client->connect();

Will return false only in cases when URL is unreachable or the port is wrong. As long as URL:port is accessible, it will return true independently of credentials provided, which seems kinda wrong.