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[Samael]

Thank you, this was useful. I've tried it again and this time I
correlated the events in the log and the tcpdump capture.

It seems that the client is requesting a window update, which doesn't
receive an answer and triggers the send timeout. I think that this is
the issue.

Thank you very much for your help.

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,222614,222621#msg-222621