On Nov 14, 2022, at 12:43 PM, Eric Rescorla <[email protected]> wrote:
> I don't believe this is correct. 

  I'd like to have a way to say "if you don't support session tickets, just 
ignore them".

  Right now, the observed behaviour is "we don't support session tickets, so we 
drop any TLS connection which uses them".

  This literally has world-wide implications for WiFi network access today.  It 
is actively preventing the use of TLS 1.3.

> I do think this document should make clear cases where you are supposed to 
> ignore specific unknown values. I think it does that for this, but if you 
> have other examples, please file an issue on RFC 
> 8446-bis:https://github.com/tlswg/tls13-spec/

  I can file an issue there.  But advice to "ignoring unknown values" is 
substantially different from "tear down the TLS session when we see a known 
extension which we don't plan to use".

  Alan DeKok.

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