对我来说，我必须在我的虚拟机上卸载“Citrix虚拟桌面代理”

问题是如何释放它，简单地使用

net stop http

https://stackoverflow.com/a/16243333/777982

以我为例，它发生在安装Microsoft Web Matrix之后。卸载这个垃圾连同“微软Web部署”解决了这个问题。

这不能解释PID方面的事情，但如果你运行Skype，它喜欢使用端口80出于某种原因。

我停止了万维网出版服务，然后它就工作了。

这些对我都没用。我不得不回答一个超级用户的问题。

If it is a System Process—PID 4—you need to disable the HTTP.sys driver which is started on demand by another service, such as Windows Remote Management or Print Spooler on Windows 7 or 2008. There is two ways to disable it but the first one is safer: Go to device manager, select “show hidden devices” from menu/view, go to “Non-Plug and Play Driver”/HTTP, double click it to disable it (or set it to manual, some services depended on it). Reboot and use netstat -nao | find ":80" to check if 80 is still used.

这招对我很管用!