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André's avatar
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André
answered 2023-11-10 20:53:06 +0000

The procedure is described here: https://wiki.wireshark.org/TLS#using-the-pre-master-secret

Make sure your capture contains the TLS handshake, otherwise the decryption will fail.
And the SSLKEYLOGFILE environment needs to be set for the TLS client (browser) or TLS server (web-service).
SSLKEYLOGFILE does not work on libraries that do not support it, like Windows Secure Channel (Schannel).