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Could not establish trust relationship

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Wesley
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Wesley asked on 29 Oct 2015, 08:36 PM

 

Great, I installed the fiddler update. Now I can no longer decrypt https client traffic while debugging.... 

"The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel"

 

 I had the fiddler cert trusted before and didn't get a prompt to trust it when enabling https decryption.

 

So I uninstalled Fiddler and removed the certs.  Then reinstalled and I get the prompt but my apps are still faiing....

The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel

 

  

 

 

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Wesley
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answered on 29 Oct 2015, 08:44 PM

Fiddler Web Debugger (v4.6.1.2)
Built: Wednesday, October 28, 2015

 64-bit AMD64, VM: 61.0mb, WS: 91.0mb
.NET 4.0.30319.34209 WinNT 6.3.9600.0

Running on Windows 8.1

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Wesley
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answered on 29 Oct 2015, 09:01 PM

Resolved this with a post Eric had already made here...

http://www.telerik.com/forums/firefox-36-0-breaks-fiddler-https-decryption#lqgIHIvos0qnERndygnFuA 

 

Turned decrypt https off and had Fiddler remove the certs.  Then restarted and reenabled https decryption. Worked

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Jeff
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answered on 12 Dec 2016, 12:01 AM

I tried the advice at the link provided for my situation and it did not work.

I have Windows 10 and Kaspersky which does not like the certificates/routing provided by Fiddler2.

This appears as a new manifestation of an old problem where no links are accessible through Firefox, Chrome, Edge/IE when Fiddler2 is operating.  Closing Fiddler2 allows browsers to work.

What is the current solution for this problem?

Thank you,

Jeff

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Payam
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answered on 13 Apr 2017, 06:42 PM
Thanks! Worked for me too!
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deadlydog-DanSchroeder
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Iron
answered on 03 Feb 2023, 10:38 PM

I fixed this issue by going into Tools -> Options -> HTTPS, clicking the Actions button, and choosing Reset All Certificates. This removed all previous Fiddler certificates, and the reinstalled new ones. I then restarted Fiddler. This got me going again.

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