Not able to login into magento admin panel

go to the following file:
app/code/core/Mage/Core/Model/Session/Abstract/Varien.php 

On Line no: 78 

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

        if (!$cookieParams['httponly']) {
            unset($cookieParams['httponly']);
            if (!$cookieParams['secure']) {
                unset($cookieParams['secure']);
                if (!$cookieParams['domain']) {
                    unset($cookieParams['domain']);
                }
            }
        }

        if (isset($cookieParams['domain'])) {
            $cookieParams['domain'] = $cookie->getDomain();
        }

Replace it to: 

 

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

        /*if (!$cookieParams['httponly']) {
            unset($cookieParams['httponly']);
            if (!$cookieParams['secure']) {
                unset($cookieParams['secure']);
                if (!$cookieParams['domain']) {
                    unset($cookieParams['domain']);
                }
            }
        }

        if (isset($cookieParams['domain'])) {
            $cookieParams['domain'] = $cookie->getDomain();
        }*/