fiddler returning “HTTP/1.1 502 Fiddler – Connection Failed” for HTTPs requests replied / made with it?

i’ve been using fiddler tool for ages. recently i’ve noticed most of my attempts of sending new requests fail with:

HTTP/1.1 502 Fiddler - Connection Failed
Date: Thu, 15 Apr 2021 14:21:59 GMT
Content-Type: text/html; charset=UTF-8
Connection: close
Cache-Control: no-cache, must-revalidate
Timestamp: 16:21:59.795

[Fiddler] The connection to '' failed.  <br />System.Security.SecurityException Failed to negotiate HTTPS connection with; HTTPS handshake to (for #7750) failed. System.Security.Authentication.AuthenticationException A call to SSPI failed, see inner exception. &lt; The function requested is not supported

Win32 (SChannel) Native Error Code: 0x80090302                                                                        


tools > options > [x] capture HTTPS CONNECTs > [x] Decrypt HTTPS traffic > protocols: enter there tls1.2

once it’s set you can un-tick [x] capture.

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