AwsInspector\Model\Ec2\Instance::canConnectTo PHP Method

    public function canConnectTo($hostname, $port, $timeout = 1)
    {
        $result = $this->exec(sprintf('nc -z -w%s %s %s', escapeshellarg($timeout), escapeshellarg($hostname), escapeshellarg($port)));
        if ($result['returnVar'] != 0) {
            throw new \Exception("Can't connect to {$hostname}:{$port}");
        }
        return true;
    }