官方版

Problem: No Traffic is captured with ProxySettingsPerUser=0 Group Policy Setting

Your system or domain Administrator has set the Group Policy setting ProxySettingsPerUser to 0. This means that instead of the default Windows behavior (each user has their own proxy settings), instead all user accounts share one set of proxy settings. In this case, a value named ProxySettingsPerUser exists inside:

  1. HKLM\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\

Solution: Run Fiddler as Administrator

This machine-wide proxy setting can only be changed by code running as an Adminstrator, so Fiddler must be started Elevated:

  1. Right-click the Fiddler icon in the Start menu.
  2. Choose Run as Administrator.

This will adjust the proxy setting.
If you cannot run Fiddler as Admin (because, for example, you’re not an Administrator) you will need to request that your system or domain administrator disable this policy:

  1.     HKLM\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\ProxySettingsPerUser is 0.

This policy setting does not impact clients that are not configured to use the system proxy settings (For example, Firefox with a manual proxy configuration).

谷歌翻译版

问题: 使用ProxySettingsPerUser=0 组策略设置不会捕获任何流量

您的系统或域管理员已将组策略设置ProxySettingsPerUser设置为0。这意味着，不是默认的Windows行为（每个用户都有自己的代理设置），而是所有用户帐户共享一组代理设置。 在这种情况下，内部存在一个名为ProxySettingsPerUser的值：

  1. HKLM\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\

解决方案: 以管理员身份运行Fiddler

只能通过以管理员身份运行的代码来更改此计算机范围的代理设置，必须重新启动Fiddler:

  1. 右键单击开始菜单中的Fiddler图标。
  2. 选择管理员运行。

这将调整代理设置。
如果您不能以管理员身份运行Fiddler（例如，因为您不是管理员），则需要请求系统或域管理员禁用此策略：

  1.     HKLM\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Internet Settings\ProxySettingsPerUser is 0.

此策略设置不会影响未配置为使用系统代理设置的客户端（例如，具有手动代理配置的Firefox）。