NET::ERR_TLS13_DOWNGRADE_DETECTED

NET::ERR_TLS13_DOWNGRADE_DETECTED is an error in Chrome with the description:

TLS 1.3 was enabled, but a lower version was negotiated and the server returned a value indicating it supported TLS 1.3. This is part of a security check in TLS 1.3, but it may also indicate the user is behind a buggy TLS-terminating proxy which implemented TLS 1.2 incorrectly. (See https://crbug.com/boringssl/226.)

It is defined in the file

This description is licensed under the Chromium license.