>The customer is uploading via a webpage .
I may have missed something, but I understand, firstly the data does not even
arrive completely on the Linux, and secondly this is probably HTTP/HTTPS data
transfer since you mention "via webpage".
It seems to me FTP is not yet involved, but a browser on the client and an HTTP
server on the Linux side. If so, have a look a the the various HTTP server log
file; the should be at leas some kind of error log.
If feasible, I would inspect the TCP/IP traffic using Wireshark on the client
sending the data. If this is HTTPS you won't see much of the data but you might
find other hints.
In addition, as other have suggested, have a detailed look at the data around
the point where the transfer stops.
--
Peter Hunkeler
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