SSL over IPv6 broken in Firefox for Windows...

[Jeroen Massar]

Alexander Mayrhofer wrote:
[..]
>> Might I suggest checking https://www.sixxs.net or 
>> https://unfix.org ? :)
>> (requires CACert or just click 'accept' ;)
> 
> Both don't work for me - same behaviour as described in the mozilla bug.
> I'll try from a different network, just to ensure it has nothing to do
> with any of the components here... (no web proxy, no NAT... Hmmm...
> Weird..)

Don't forget the option: No Stupid Firewalling software....

Too many "firewalls" simply don't understand IPv6 and thus just either
drop all IPv6 packets (thus causing 20second+ timeouts) or at least
reject them, which would look like what you see in your wireshark.

As such: install Windows Defender, go to "Tools" -> "Software Explorer"
-> "Winsock Service Providers" and see what junk is there to hijack any
Winsock (and thus IPv4+IPv6) connections.

And of course you might also just want to check that you actually have
proper IPv6 connectivity.

Greets,
 Jeroen

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