Was that on a local machine?

tested on local and remote machines.

for example http://yaws.hyber.org/upload0.yaws
i tried an 4,9 MB file and get an "The connection was reset" after some time.
I use Yaws version 1.87

after some tries the biggest file i could upload was 3,1 MB big.

well, the limit 3.~ MB may be set to avoid DOS. So use only your own environment to test uploads. 

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