Magento : Invalid form key. please refresh the page error

your facing the issue, comment below line from app/code/core/Mage/Core/Model/Session/Abstract/Varien.php file line 

• // 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']);
          }
      }
  }