官方版

Microsoft ISA Firewall client may cause Fiddler to detach. When starting Fiddler under nonadmin account (ordinary User) you may see an error message:

  1. Unable to bind to port [Localhost: 8888]. This is usually due to another running copy of Fiddler.
  2. (An attempt was made to access a socket in a way forbidden by its access permissions)

Fix: Close Fiddler. Using REGEDIT, add a new STRING under HKCU\Software\Microsoft\Fiddler2named ExclusivePort with value False
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谷歌翻译版

Microsoft ISA防火墙客户端可能导致Fiddler分离。 在非管理员帐户（普通用户）下启动Fiddler时，您可能会看到一条错误消息:

  1. Unable to bind to port [Localhost: 8888]. This is usually due to another running copy of Fiddler.
  2. (An attempt was made to access a socket in a way forbidden by its access permissions)

修复：关闭小提琴手。 使用REGEDIT，在HKCU\Software\Microsoft\Fiddler2下添加一个新的STRING，命名为ExclusivePort，值为False