Can not login into an appweb !

Hi,


I have just configured my app domain to create sharepoint-hosted apps. 

( I have created a new domain to host my apps. The "Option A" of this guide : 
http://sharepointchick.com/archive/2012/07/29/setting-up-your-app-domain-for-sharepoint-2013.aspx 
)

And then finally deployed my app.

I can see my app in my site. But when I click on it, windows security asks me credentials and my valid credentials do not work. 

I see the url on credential screen, it says : connecting to app-56d0d41245e321.bilgeapps.com

So my app is created. I just can not see it ? 

I appriciate your help.
Thank you.