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The "409 CONFLICT" error is happening on ping commands, not sync. Typical request is:
POST /servlet/traveler/Microsoft-Server-ActiveSync?User=redacted&DeviceId=Appl88926N4U3NR&DeviceType=iPhone&Cmd=Ping HTTP/1.1
Running a couple of searches in the web server log over a few days of data gives 1,763 PING requests. 1,095 of them were successful with 200 OK codes and 668 of them threw 409 CONFLICT.
Even more interesting is the response time. I'm showing PING commands with the response time ranging from 0 ms to 303,110 ms. That last one is five minutes.
The 300,000 ms is not an anomaly. The overwhelming majority of the response times are roughly 80,000 ms to 300,000 ms with an approx average of 200,000 ms.
Oddly, successful responses ("200 OK") don't appear to take any less time than the "409 CONFLICT" responses.
SYNC commands take dramatically less time, usually just 75 ms to 300 ms. And, out of 10,000+ SYNC requests in the web server log, only one did not return a 200 OK. So there is no problem happening with the SYNC.
What are the PING commands doing? Why would the responses be so unreliable and take so long? Is there at timeout value at 5 minutes that it is hitting, and where might that setting be stored. Lastly, does it matter?
Thanks again,
-- Mike
Feedback response number WEBB7X8QJQ created by ~Dana Kivelusteroni on 10/27/2009
Re. 409 error w/Traveler and iPhone
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. . . . . . Re. 409 error w/Traveler and iPhone... (~Dana Kiveluste... 27.Oct.09) 
