Hi, 

Can you check the offered cipher using openssl s_client ? 

It could be that there is no suggested cipher or changing suggested cipher 
between ipv4 vs ipv6, (something that can happen with some farms and other load 
balancing systems) . 


On Thursday, 11 January 2024 12:18:24 IST Rabin Yasharzadehe wrote:
> Nice catch,
> 
> IPv4 works, as the moment I remove the address from my interface, I can
> connect to the site.
> From what I can see, it does able to complete the TLS handshake, and I can
> see the certificate.
> And I see the same behavior from inside a container.
> 
> Ping to the address seems to be working, and I don't see any routing issue
> to the destination.
> 
> Issue with telegram service?
> 
> 
> 
> --
> Rabin
> 
> 
> On Wed, 10 Jan 2024 at 07:52, Lior Okman <l...@okman.name> wrote:
> 
> >
> > Looking at the curl output, it manages to connect using IPv6 and is timing
> > out on the SSL negotiation.
> >
> >
> > Few things to check:
> >
> > - Does this work for you with IPv4?
> > - Can you use "openssl s_client" to see if your environment manages to
> > finish the SSL handshake?
> > - Can you try to connect from inside a Docker container that is using a
> > different base distro?
> >
> >
> > --
> > Lior
> >
> >
> >
> > ---- On Tue, 09 Jan 2024 13:17:23 +0200 *Rabin Yasharzadehe
> > <ra...@rabin.io <ra...@rabin.io>>* wrote ---
> >
> > Hi list,
> >
> > Can you please help me identify if the issue, is in my end / ISP (Bezeq)
> > and not the service it self.
> >
> > When I try to load telegram web, with IPv6 address, the connection will
> > hang for me.
> >
> >
> > ❯ curl --connect-timeout 3 -Iv6 https://web.telegram.org/
> > * processing: https://web.telegram.org/
> > *   Trying [2001:67c:4e8:f004::9]:443...
> > * Connected to web.telegram.org (2001:67c:4e8:f004::9) port 443
> > * ALPN: offers h2,http/1.1
> > * TLSv1.3 (OUT), TLS handshake, Client hello (1):
> > *  CAfile: /etc/pki/tls/certs/ca-bundle.crt
> > *  CApath: none
> > * SSL connection timeout
> > * Closing connection
> > curl: (28) SSL connection timeout
> >
> >
> > But I don't have this issue with other IPv6 services, like google.com
> >
> > Can you please check on your side? and which ISP are you using?
> >
> > Thanks. Regards
> >
> > --
> > Rabin
> > _______________________________________________
> > Linux-il mailing list -- linux-il@cs.huji.ac.il
> > To unsubscribe send an email to linux-il-le...@cs.huji.ac.il
> >
> >
> >
> 




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