magento后台无法登陆的问题

解决方法：
打开 magento/app/code/core/Mage/Core/Model/Session/Abstract/varien.php
将// set session cookie params
session_set_cookie_params(
$this->getCookie()->getLifetime(),
$this->getCookie()->getPath()
$this->getCookie()->getDomain(),
$this->getCookie()->isSecure(),
$this->getCookie()->getHttponly()
);
改为：
// set session cookie params
session_set_cookie_params(
$this->getCookie()->getLifetime(),
$this->getCookie()->getPath()
//$this->getCookie()->getDomain(),
//$this->getCookie()->isSecure(),
//$this->getCookie()->getHttponly()
);

FROM: http://bbs.magento-china.org/viewthread.php?tid=452