CODEWITHSUNDEEP
fiddler
Abhi
Abhi

Reputation: 281

Fiddler fails after CONNECT to HTTPS service

Fiddler is unable to connect to my https server and is failing in the CONNECT stage itself. Firefox opens the site just fine. Here [1] is a screenshot of the requests. I tried with Charles and it was able to list the request but failed to decrypt the requests [2].

Please note that other HTTPS services seem to be working fine with fiddler

1: https://i.sstatic.net/vit3Y.jpg

2: https://i.sstatic.net/5BnYZ.jpg

Upvotes: 18

Views: 16260

Answers (5)

Longfei Wu
Longfei Wu

Reputation: 845

Try run Fiddler as Administrator. This is what works for me.

Upvotes: -1

hoggar
hoggar

Reputation: 3817

Tools/Options/HTTPS ... Change TLS1.0 to TLS1.2 worked for me ...

enter image description here

Upvotes: 32

Sandeep Khantwal
Sandeep Khantwal

Reputation: 381

I did add Fiddler root certificate in IE and Firefox. Still I was getting this ..... System.Security.Authentication.AuthenticationException A call to SSPI failed The function requested is not supported fiddler

I solved this by adding tls1.2 & tls1.2 under Tools--> Fiddler Options --> HTTPS (Tab) --> Enabled Protocols, and Fiddler started capturing https traffic from browsers.

Upvotes: 4

pmeyer
pmeyer

Reputation: 890

What worked for me:

Tools -> Fiddler Options -> HTTPS -> Reset All Certificates

Then I got prompted to create a new Fiddler certificate and trust it via windows.

Upvotes: 3

blacktau
blacktau

Reputation: 169

I had a similar issue with all SSL sites. It seems to happen when there are a lot of certs in the following folder C:\Users\<username>\AppData\Roaming\Microsoft\SystemCertificates\My\Certificates

stopping fiddler, emptying the folder and starting it up again fixed the issue for me.

Upvotes: 3

Related Questions