txsni + alpn + acme (letsencrypt)

Daniel Holth <[email protected]> Sat, 23 Mar 2019 10:21:52 -0400

Newsgroups	gmane.comp.python.twisted
Message-ID	<CAG8k2+43zt6SR8c+k8_+ctprRw_JbHuHC9FPEWi9DLGKK2Yk+g@mail.gmail.com>

Hello. Can you help me to learn to debug tls problems in twisted?

I was disappointed that txacme, an automatic way to get certificates for
twisted web, stopped working, so I'm trying to add a responder for the new
challenge type. It sends a special certificate if the CA negotiates acme
using alpn, proving domain control, then you get a certificate.

Seems to work with openssl s_client but letsencrypt says "no application
protocol". Anyone know where that error comes from?

https://github.com/glyph/txsni/pull/26

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