In IE8, if I mark "Enable HTTP1.1. through proxy connections" in the IE settings
I'm not sure why you need that?
In IE8, only if I enable "HTTP1.1. through proxy connections" I am able to do multiple file uploads.
After investigating further on the problem, I found that when NTLM is enabled, rich:fileUpload does not work if I use allowFlash=true. Can you please suggest the possible solution for this problem?