Solution:
I don't have proper solution for this..
but i will provide workaround for this..
Start Internet Explorer by using the Run as different user option, and then go to the SharePoint site.
Note: The Run as different user option is visible if you hold the Shift key when you right-click a program icon.
Access the SharePoint site by using the the URL as http://siteurl/_layouts/closeConnection.aspx?loginasanotheruser=true
