I'm currently testing a webmail application and I'm faced with an error while running a scenario that involve attachment.

The script runs correctly when executed by the virtual generator but when I start the controller with this scenario (even with a lonely virtual user) an error appears when the file is being uploaded (27782 error write to host "webmail" failed).

However the same scenario works correctly on the controller if the size of the file uploaded is under 10k or if I disable SSL on the Apache server.

Is there some kind of parameter or functions, that need to be present and that I missed, in order to make transfer of larger files works?