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