我无法通过 Firefox 访问我的本地主机服务器。我使用 Apache，并尝试运行以下命令
$ service apache2 status
* apache2 is running
$ sudo service apache2 restart
* Restarting web server apache2 [ OK ]
$ sudo netstat -nlp | grep apache
tcp6 0 0 :::81 :::* LISTEN
2658/apache2
有什么帮助吗？
Firefox 显示此错误消息：
"Unable to connect
Firefox can't establish a connection to the server at localhost.
The site could be temporarily unavailable or too busy. Try again in a few moments.
If you are unable to load any pages, check your computer's network connection.
If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web."