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Webdav Server upload issues

Hello, We are running a Microsoft 2012 Server with the WebDAV features enabled. It is being used as a means of transferring files two and from mobile devices ie iPads and Android devices.

The setup seems fine and on the whole the server works very well over our 100mb leased line. The main issue is the transfer from mobile devices to the WebDAV server of large files such as movies. Anything over 25mb seems to fail most time and anything above 40mb fails all the time. We receive timeout errors and 500 errors from out WebDAV apps (ie WebDAV Navigator) on the mobile devices. Looking at the server there does not seem to be a setting restricting the size of the uploads. Any ideas what this may be? Same tests with mobile device connected to the same LAN as the server and with 1gb connectivity produces the same failed resultas so it's not a bandwidth issue. Pictures, Docs and any other reasonably sized files work very well. Any ideas?

Regards, Aelara.
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Aelara
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Aelara
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Cliff GaliherCommented:
My first inclination is to think latency is an issue. While pure bandwidth may not be be a problem, if you haven't enforced any QOS, your bandwidth may be seeing short bursts of saturation and that is causing then connection to time out. The longer the upload takes, the greater the odds that this will happen, which is why 25 is sporadic, and 40 is predictable. You'll probably have to resolve this at your network edge with QoS.
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