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Re: EWW problems with SNI https sites?


From: Robert Pluim
Subject: Re: EWW problems with SNI https sites?
Date: Mon, 15 Jul 2019 12:28:52 +0200

>>>>> On Sat, 13 Jul 2019 22:24:40 -0700, Hideki Saito <hidekis@gmail.com> said:

    Hideki> I think I've figured out pattern, although I'm not still sure 
what's going
    Hideki> on.
    Hideki> This probably is not really related with SNI, but related to IPv6 --
    Hideki> perhaps there's some incompatibility with the way Windows IPv6 stack
    Hideki> handles thing; if I disable IPv6, I'm not seeing this is happening. 
(And
    Hideki> this seems to be Windows specific issue as this does not happen on 
Linux on
    Hideki> the same network.)

    Hideki> For the same reason, other places like https://wikipedia.org also 
fails.
    Hideki> (Where it resolves to IPv6.)
    Hideki> Anyone encountering similar issue and any workaround? 
(Unfortunately I
    Hideki> can't really disable IPv6 as I'm relying certain things for it. 
Wondering
    Hideki> if there's a way to disable IPv6 just for Emacs...)

Based on your original report of the error message "The plain HTTP
request was sent to HTTPS port", this is an issue Emacs has with
falling back from IP address A + TLS to IP address B + TLS, which
tends to manifest itself when the DNS response for a host returns an
IPv6 address, but that address is not actually reachable over IPv6.

I have a potential fix which I can send you as a patch, assuming you
can rebuild emacs.

Robert



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