I'm glad you solved your problem..
However I am rather surprised that changing the Upload Packet Size solved the problem.
The Upload Packet Size changes the size of the internal memory buffer used when performing a Winsock.Send().. The amount of data that is sent per Winsock.Send()
If the Upload Packet Size is larger than 8kb then the send buffer size is increased using setsockopt (SO_SNDBUF)
I will continue to look into this matter.
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