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Decrypting PPPoTLS traffic

Hello everyone, I've a packet capture with PPPoTLS (Point-to-Point Protocol over TLS) traffic in it. I'm capturing the SSL vpn traffic comming from a client to an SSL VPN server.

I was able to get the pre-master key and decrypt the traffic in wireshark successfully. However, once decrypted, wireshark doesn't seem to recognize the PPP traffic inside TLS.

All wireshark displays is "Protocol: HTTP, Info: Continuation", in the HTTP layer I see only Data with hex values in it. I tried to : right click on a packet > decode as.. > and change from HTTP to PPP, but PPP is not even an option.

Could you please help me to make wiresharke display the PPP traffic ?

Many thanks, Karim