Hi:
The Problem
I ran into a very odd, at the time, issue after I deployed my applications. I opened various directories on different web servers using an admin account. I deployed my apps, but when I browsed to the apps they failed, because they wouldn't authenticate my personal account which I was signed in with on my local desktop.
The Cause
When browsing to the the various applications via IE, windows used the same account you used when deploying your application (admin account). So, your apps are not broken, you just get authentication issue since Windows is saving the accounts your are using to log into your web servers.
The Solution
Open your control panel and delete your saved passwords.