I have magento website. Its admin panel is not working with correct credentials. when i comment this code

```
$cookieParams = array(
     'lifetime' => $cookie->getLifetime(),
     'path'     => $cookie->getPath(),
     'domain'   => $cookie->getConfigDomain(),
     'secure'   => $cookie->isSecure(),
     'httponly' => $cookie->getHttponly()
);

```

in `/app/code/core/Mage/Core/Model/Session/Abstract/Varien.php`
them my website shows blank page and after uncommenting this code my website again stops working and shows me a blank page.