有时，在使用Liferay Portal 6.1.1时，我会收到包含下一个内容的错误页面
有人可以解释，如何解决这个问题？
内容：
The page cannot be displayed
Explanation: The Web server refused the connection, possibly because a service on the upstream server is inactive.
Try the following:
Refresh page: Search for the page again by clicking the Refresh button. The timeout may have occurred due to Internet congestion.
Check spelling: Check that you typed the Web page address correctly. The address may have been mistyped.
Access from a link: If there is a link to the page you are looking for, try accessing the page from that link.
Contact website: You may want to contact the website administrator to make sure the Web page still exists. You can do this by using the e-mail address or phone number listed on the website home page.
Technical Information (for support personnel)
Error Code 10061: Connection refused
Background: When the gateway or proxy server contacted the upstream (Web) server, the connection was refused. This usually results from trying to connect to a service that is inactive on the upstream server.
在我添加防火墙的配置代理设置之前，我认为这是问题，但它没有帮助。
有时门户网站显示另一个错误页面，也许他们有依赖，另一个 error page