This is a migrated thread and some comments may be shown as answers.

CryptographicException Unspecified error (decrypting SSL traffic)

2 Answers 1206 Views
Windows
This is a migrated thread and some comments may be shown as answers.
dan
Top achievements
Rank 1
dan asked on 30 Jul 2018, 08:55 AM

I am having problems decrypting any SSL traffic on my Windows 10 PC.

I have tried Eric's post on resetting certificates to no avail.

I am seeing this on all SSL requests, this one is for the first request to fiddler to check for fiddler updates, for example: 

09:50:02:3744 fiddler.network.https> HTTPS handshake to www.fiddler2.com (for #1) failed. System.Security.Cryptography.CryptographicException Unspecified error

To try and isolate the issue I installed Charles and it is able to decrpyt SSL requests so I dont believe it is a system-wide / local network issue.

Any help much appreciated as Fiddler is such an excellent tool.

2 Answers, 1 is accepted

Sort by
0
dan
Top achievements
Rank 1
answered on 31 Jul 2018, 01:27 PM

So I have now got Fiddler working again, these steps fixed my problem:

  • Remove Fiddler certificates (via the GUI, and manually check in Certificates mmc)
  • Uninstall Fiddler, including all settings data
  • Use a registry cleaner to clean up orphan / broken entries
  • Delete any remnant folder related to Fiddler
  • Download latest version of Fiddler
  • Install using all defaults (dont install to a custom location)
  • Set HTTPS Capture and Decrypt in Fiddler
0
Alexander
Telerik team
answered on 02 Aug 2018, 10:56 AM
Hello,

Glad to hear you figured it out. Usually, clearing the certificates is sufficient, but it seems that didn't worked out in this case.

Regards,
Alexander
Progress Telerik
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Feedback Portal and vote to affect the priority of the items
Tags
Windows
Asked by
dan
Top achievements
Rank 1
Answers by
dan
Top achievements
Rank 1
Alexander
Telerik team
Share this question
or