对我来说，它在停止Web部署代理服务后工作了。

一个名为“Web部署代理服务”(MsDepSvc)的新服务也可以触发PID=4的“系统”在80端口上监听。

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!

BranchCache是我的问题。我的决心是以管理员的身份运行Powershell，然后运行:

Disable-BC -Force

参考:https://learn.microsoft.com/en-us/powershell/module/branchcache/disable-bc?view=win10-ps

我只是去服务和停止web部署代理