Blog in Azure: IPv6 fail on some users

Thursday, July 13. 2017

This is what I got from an IPv6-user:

The TLS-handshake succeeds, but after that everything breaks loose. TCP-packets are out-of-order, there are retransmissions. The above packet capture starts at second 23 and there is a failing retransmission at second 53, so obviously there is not much of a service from my website. :-(

There are perfectly working IPv6-users, I have requests from 14 separate IPv6-addresses in log, so it works perfectly for somebody. Ultimately I have no idea what's going on, or how to fix it. If you know, drop me a comment.

by Jari Turkia in Blog at 21:12 | Comments (3) | Share in LinkedIn

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Aleksandersen on :

For what it’s worth: I just accessed your website over IPv6 and didn’t run in to any problems. I can see that the IPv6 address I’m connecting to is owned and operated by Microsoft.
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Jari Turkia on :

Thanks for that info.

The tests I have done indicate the same. Also, I'm running Pingdom IPv6-tests which indicate full functionality. It seems, that there is something wrong with one specific ISP.
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