Receiving packet failed: (10054) (2nd post)

[Henk]

I will be more than happy to try and investigate this issue some more. 
The only thing I have tried is to get it to stop throwing that error. I did not take the time to see if I could get the error back by reversing the settings. I will try and do that later, when the computer concerned is not used.

The  10054 error was reported on the computers (multiple) trying to connect to the computer that had the problem. The IPv6 settings where changed on the computer that had the problem.

I had never heard of Teredo before (I looked it up on wikipedia). Is it started by default on Windows 10? How can I check if it is running?

Would you run Wireshark on the client with the problem or on one of the other clients? Should I listen to the physical network card or to the OpenVpn card?




-----Oorspronkelijk bericht-----
Van: tinc [mailto:tinc-bounces at tinc-vpn.org] Namens ????
Verzonden: dinsdag 27 september 2016 05:43
Aan: tinc at tinc-vpn.org
Onderwerp: Re: Receiving packet failed: (10054) (2nd post)

On Mon, 26 Sep 2016 20:40:47 +0000
Henk <henk at innomeer.nl> wrote:

> Thank you for your response.
> Yes, I know something changed, hence the smiley.
> 
> I have looked at the code (I was able to build it under the new 
> windows bash). It turns out that the error was on a udp receive, not a 
> tcp connection. Didn't know you would get this error.
> 
> Anyhow near the location of the error there was a remark about IPv6.
> I hadn't looked at that yet. So I turned IPv6 off at the client that 
> could not be reached and now it works.
> 
> Maybe I should look at when and how to use IPv6 someday, when there 
> are more than 24hs in a day. Now I'm happy it works.

It should be interesting to know what exactly version of Windows runs at faulty client? And was any of IPv6 services activated on it (including Teredo)?

Your tcpdump (or whatever on Windows, Wireshark?) should show ICMP Unreachable packets before that error. At least many people get this when they receive 10054 error on UDP sockets.

http://stackoverflow.com/questions/34242622/windows-udp-sockets-recvfrom-fails-with-error-10054
http://stackoverflow.com/questions/2576926/python-socket-error-on-udp-data-receive-10054

So probably more workarounds for Windows. One of them is probably ignoring 10054 return value of recvfrom on Windows.
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