Fiddler how to remove HTTPS extensions?

Question

I'm attempting to strip TLS SNI headers. How can I manipulate HTTPS extensions using Fiddlerscript?

Answer 1

Unfortunately, the .NET Framework does not expose the level of granularity you require for the SslStream class (and Windows itself doesn't make it easy either). The only way you can achieve what you're looking for with Fiddler today is to disable TLS1 and offer only Ssl3.

To update your FiddlerScript, click Rules > Customize Rules. Scroll down to the Main() function and add the following line within the function:

CONFIG.oAcceptedServerHTTPSProtocols = System.Security.Authentication.SslProtocols.Ssl3;