IIS7 showing iisstart.html instead of default document

I've a Sitefinity 4.1 website running on IIS7, I am setting "Default.aspx" at the top of the default documents list, but when I access http://www.*.org/ it shows the IIS7 welcome page.

When I access http://www.*.org/default.as开发者_开发知识库px it works just fine.

I checked the defaultDocument section in the Web.config and it is set correctly, recycled the app pool, restarted the website site, nothing so far.

What am I missing?

EDIT :

It seems to be a caching problem, if I add junk query string parameters it redirects to the correct page, ex : http://www.*.org/?aaa

Hit F5 on the browser. iisstart.html often is cached in the browser.

ctrl + shift delete on your browser clear all the cache. then close browser and try again