Thank you for your efforts! Meanwhile i will try wsgi from IIS.
The main question - can I rollback to some last year version before some code improvement, where uploads were robastly stable??? Namely suspicious copystream from fileutils.py which open error bringing socket. Or may be somewhere to extend timeout ? or keep-alive flag? FYI: In IE7 there is progressbar in the middle of the statusbar, filled with green squares Vale!
