您将需要在Magentos admin->system->configuration->web->cookie domain中的.domain.com中输入.就像前面提到的Erickthered一样，您需要将Cookie设置为对其他子域可用，以使其能够被读取.所有Web应用程序都一样.

You will need to enter in .domain.com in Magentos admin->system->configuration->web->cookie domain. Like erickthered mentioned, you will need to make the cookie available to your other subdomains in order for it to be read. This is the same with all web applications.

参考: http://www.magentocommerce. com/wiki/modules_reference/english/mage_adminhtml/system_config/edit/web#session_cookie_management_field_descriptions