Decrypting HTTPS traffic/Certificate issues

[Wei Ler]

Hello, I'm a new fiddler user trying to configure to capture traffic from the iOS connected. I'm trying to follow this one here, http://docs.telerik.com/fiddler/Configure-Fiddler/Tasks/ConfigureForiOS, but got stuck at the steps to decrypt HTTPS traffic from iOS devices. I've installed certmaker, but when I tried to configure windows client to trust fiddler root certificates, it all went haywire with loads of errors around.

Firstly, when i try to enable HTTPS traffic decryption by clicking the decrypt HTTPS traffic box, a box showing "Could not load type 'Fiddler.lCertificateProvider4' from assembly 'Fiddler, Version=4.6.20172.34691, Culture=neutral, PublicKeyToken=null'." appears.

If I ignore the box and proceed with trusting the root certificate, the same box appears instead of the installing certificate notice.

Next, if I tried to export the certificate from what I've read around, this shows up: "---------------------------
Certificate Export Failed
---------------------------
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.

Could not load type 'Fiddler.ICertificateProvider4' from assembly 'Fiddler, Version=4.6.20172.34691, Culture=neutral, PublicKeyToken=null'.

Type: System.TypeLoadException
Source: mscorlib
   at System.Reflection.RuntimeAssembly.GetExportedTypes(RuntimeAssembly assembly, ObjectHandleOnStack retTypes)

   at System.Reflection.RuntimeAssembly.GetExportedTypes()

   at Fiddler.CertMaker.Œ() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\CertMaker.cs:line 111

   at Fiddler.CertMaker.EnsureReady() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\CertMaker.cs:line 69

   at Fiddler.CertMaker.() in C:\JenkinsHome\jobs\FiddlerReleaseBuild\workspace\Fiddler2\Common\Core\CertMaker.cs:line 184


Fiddler v4.6.20172.34691 (x64 AMD64) [.NET 4.0.30319.34209 on Microsoft Windows NT 6.3.9600.0] 
---------------------------
OK   
---------------------------
"

Am at a big loss here, could it be the certmaker that is the issue or did I configured wrongly ?

[John]

I'm facing the same issue too. And it seems like CertMaker is the culprit here, once I uninstalled CertMaker addon I was able to generate root certificate and decrypt HTTPS traffic.

[Wei Ler]

Alright ! I'll give it a shot and see how that goes !     

[Daniel]

I uninstalled the CertMaker extension but that did not solve my problem. While I no longer receive the error when attempting to create a certificate, and instead it is automatically generated, the certificate that was installed on my iPhone is listed as "Not Verified". Consequently, none of the HTTPS requests that were captured from my iPhone are decrypted. I've tried this on both my Windows 7 and Windows 10 laptop at work.  The problem seems to be with the certificate.  It used to be "Verified" under my profiles in device management. Now I wish that I hadn't deleted those.

[Yazif]

I'm facing the same problem. Tried reinstalling fiddler and cert maker to no avail. I'll  have to try another tool.

[Tsviatko Yovtchev]

Hello,

We are aware of the problem and we're working on a fix. Please, stay tuned for more information on this.

Regards,
Tsviatko Yovtchev
Progress Telerik

[Alexander]

Hi all,

We've just released new version of Fiddler and this problem is now fixed. Please, excuse us for the inconvenience caused.

Regards,
Alexander
Progress Telerik

[Daniel]

Thanks for fixing it so quickly!!