Tried both ie6 and ie7 using wine+winetricks. I go to a site that needs Windows Authentication (i.e. your domain user/pass) and type in the credentials and it doesn't work. Works in Windows in same IE versions or on linux in Firefox/Chrome (limited functionality, hence why I need IE thru wine). I believe the problem has to do with how wine redraws the Authentication Required popup prompt. Has anyone worked thru this issue before?