I have not narrowed down the file size that triggers the failure, however I am consistently not able to upload files larger than about 1.2MB. A Network Connection error happens, or at least that is the error presented to me. I have wiped and reformatted the SD card, it is 8GB. I have tested the card to ensure it is not damaged or corrupt. I have installed the 3.5.4 version of all and still cannot upload large files. Anything under 1MB uploads just fine. Any thoughts on what I should look at next?

@bdelia Thanks for the Wireshark dump. What I find odd is that your PC keeps aborting connections to the Duet, which shouldn't happen unless you set the number of AJAX retries in DWC -> Machine-Specific to a very high value. If that is the case, the effective timeout of regular requests becomes very low which may lead to complications. In doubt, perhaps delete dwc-settings.json from the System Files and reload DWC. If that does not help, I suggest you try a different device (like a smartphone) to upload a bigger file. If that works, try to reset the TCP/IP stack of your Windows machine as outlined here: https://support.microsoft.com/en-us/topic/how-to-reset-tcp-ip-by-using-the-netshell-utility-d954430c-9b11-43f0-6081-0fc9235a8b4a That might help, too. What kind of microSD card do you have? From the Wireshark dump I can see that RRF doesn't seem to accept more data within 15+ seconds so that does seem like an I/O issue to me. It might be worth to replace the SD card with a class 10 (possibly even A-rated) microSD card and to check if the problem persists then.

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Unable to upload files larger than approx 1.2MB

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Duet Web Control

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bdelia @Phaedrux
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@Phaedrux @chrishamm @dc42
I ended up resetting my laptop OS and am now able to upload large files.

I appreciate all of you help and suggestions.
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