500 internal server on IIS

I am using server side processing for my datatables in MVC 2.0 hosted on a server using IIS 7.0. I have a controller which I am using to handle the incoming requests. When I view the page on my localhost , it works fine and this is a sample of the request header it sends

http://localhost:42417/EmissionByRegion/DataProviderAction?_=1337611318226&sEcho=1&iColumns=40&sColumns=&iDisplayStart=0&iDisplayLength=10&mDataProp_0=0&mDataProp_1=1&mDataProp_2=2&mDataProp_3=3&mDataProp_4=4&.......[it
 goes on till 39 columns]

This gets a valid json response and everything works well. But when I publish this code on a server which is using IIS , when there is a postback to the server with the same request parameters. In that case , I get the following Error

500 - Internal server error.
The page cannot be displayed because an internal server error has occurred.
Module IsapiFilterModule
Notification AuthenticateRequest
Handler ExtensionlessUrlHandler-Integrated-4.0
Error Code 0x8007007a

What do I do to get around this problem.

The first thing you should do is enable detailed error mode by adding the following to the system.webServer section of your web.config:

<httpErrors errorMode="Detailed" />