The error log only reports the usual "premature end of script headers".
After some tips from other Monks i created another test that shows that CGI is installed and works fine without Image::Magick involved. see revised question if interested.

thanks much, stonebreaker

In reply to Re^2: large file upload fails on 'new CGI' request by stonebreaker
in thread large file upload fails on 'new CGI' request by stonebreaker

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