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I am trying to find out the TLS version used while calling third party APIs, I have captures these API request/response through fiddler but its not showing the TLS version used in this request. I have followed the below link: How to test which version of TLS my .Net client is using

As per above link, the TLS version can be found in TextView. Below is the snapshot what it showing to me in TextView: Fiddler Snapshot

Any help in this regards will be greatly appreciated.

Thanks

kamal
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    Have you considered using WireShark? https://www.wireshark.org/download.html – DontThinkJustGo Apr 25 '18 at 16:11
  • Apparently if you go to the Rules menu and desselect Hide CONNECTs, it will show you the tls version. – DontThinkJustGo Apr 25 '18 at 16:15
  • I have already tried it with both "Hide CONNECTs" selected and un-selected, but it shows same results. – kamal Apr 25 '18 at 18:11
  • A CONNECT only occurs if the TCP connection was closed. Therefore for enforcing a CONNECT you have to restart the application or Fiddler. – Robert Apr 26 '18 at 18:15
  • Keep in mind that the TLS version used by the destination depends also on the client! When A calls B over https then both A and B negotiate which TLS version they will use, usually they use the highest common supported version by both A and B. – Siraf Oct 06 '22 at 14:53

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