As I remember sngrep doesn't work with TLS 1.3, so may be it is your case.

On Tue, 8 Dec 2020, 08:01 Agiftel, <agiftel@gmail.com> wrote:
Hi all, does anyone was able to use sngrep (with -k option) to decrypt TLS
connections?
I'am doing what help says; used private key is the correct one; but no
traffic is seen on sngrep.
If i use not ecrypted call i can see everything, so sngrep is working good.

Any hint?

regards




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