Invalid authentication headers problem?

So, on my Windows 7 laptop, I've built a web application in ASP .NET 3.5 [C#]. the site works fine. I'm using IIS7. The site does use forms authentication. A client of mine wanted to host the site on his windows server 2008 server and is running into a:

"HTTP Error 401.2 - Unauthorized You are not authorized to view this page due to invalid authorization headers."

error. I am by no means knowledgeable in this area of the whole "setting up a website" process, which is why I use GoDaddy for this part. So I'm trying to figure out how to start trouble shooting this to help out. What are some possible causes / solutions to this error?
Michael SterlingWeb Applications DeveloperAsked:
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upalakshithaConnect With a Mentor Commented:
Here are valuable info. check these
From above article
I had very similar issue and errors. The simple fix (for my issue at least) was to properly sync the service account credentials on the App Pools with the root_path user credentials. They had gotten out of sync via our automated password updating process.
Michael SterlingWeb Applications DeveloperAuthor Commented:
@ upalaskshitha thank you for your response and links. the guy that i'm working with has managed to make some progress. he's made some changes to IIS (possibly other server changes) that have allowed him to get to an "Authorization Required" window / prompt. We need to bypass this window and use my login page in my application only. How do we get there? The "Authorization Required" page is a windows prompt / authentication page i believe. We need it to use my built in login.aspx page only.
Michael SterlingWeb Applications DeveloperAuthor Commented:
thank  you
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