Very often when people hit an error in a production site, it could be hard to get the details you need to figure it out.
Resist the temptation to post "The page doesnt work" on the forums. We can't help you if you can't give us the details.
Learn how to use one of the 4 IIS and ASP.NET logs to get the error details on any production server:
The 4 server logs you NEED to know to fix any IIS / ASP.NET error
Then, post the relevant details and we can help quickly. And please, no more "page doesnt work"!
Best,
Mike