What's QUIC?

Prometeus Yes and no. This wasn't meant to be a troubleshooting article so I didn't touch on that question, but it's a good one to ask.

Your concern has been voiced by just about everyone who troubleshoots network connections. There are projects underway to allow QUIC decryption on the client and server. Such as this one by Wireshark, which can decrypt QUIC on Chrome 89+ when an SSLKEYLOGFILE is setup on the OS and key logging is enabled in Chrome. This should carry over to other Chromium-based browsers.

https://gitlab.com/wireshark/wireshark/-/issues/17111

Firefox may support it, the SSLKEYLOGFILE file format is a Mozilla creation. I haven't seen documentation one way or the other involving QUIC, however.

MsQuic has SSLKEYLOGFILE support, as of v1.1, but, as I understand it, MsQuic requires the driver or application to enable and use it. Support for decryption is disabled by default.

https://github.com/microsoft/msquic/blob/1fccd8e51cf28f450c64137feca43a98973d7f02/docs/Release.md

• Added (off by default) SSLKEYLOGFILE support.

MsQuic logging is an okay substitute when decryption is not an option.

https://github.com/microsoft/msquic/blob/main/docs/Diagnostics.md

The "no" involves data on the wire, which cannot be decrypted. You must make a concerted effort on OS and application to enable QUIC TLS decryption.