User Authentication Failure

Dec 22 2014 6:00 AM
Hi Guys,
 
I have an web application implemented using asp.net membership forms. Also, it has got lots of telerik grids involved. The issue i am currently facing is the web application throws a run time error when i tried to login. But the same site is working fine for some other people. it actually works through windows credentials. I have checked the IIS, it is showing status as running. Please provide some inputs on this query.
 
Regards,
Sivapratap.