My Environment: 1. 64-bit AMD64 2. .NET 4.5.2 WinNT 6.1.7601 SP1 I've tried two validation engines(MakeCert,CertEnroll). The following error occurred when I was using the MakeCert engine: --------------------------- Uncaught Exception in Session #32 --------------------------- Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler. 未能从程序集"Fiddler, Version=4.6.20172.34691, Culture=neutral, PublicKeyToken=null"中加载类型"Fiddler.ICertificateProvider4"。 Type: System.TypeLoadException Source: mscorlib 在 System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes) 在 System.Reflection.RuntimeAssembly.GetExportedTypes() 在 Fiddler.CertMaker.() 位置 C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\CertMaker.cs:行号 111 在 Fiddler.CertMaker.EnsureReady() 位置 C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\CertMaker.cs:行号 69 在 Fiddler.Session.(Session ) 位置 C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\Session.cs:行号 5583 在 Fiddler.Session.() 位置 C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\Session.cs:行号 3519 在 Fiddler.Session.(Object ) 位置 C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\Session.cs:行号 3347 Fiddler v4.6.20172.34691 (x64 AMD64) [.NET 4.0.30319.36373 on Microsoft Windows NT 6.1.7601 Service Pack 1] --------------------------- 确定 ---------------------------