In this post we will see how to force user to enter credentials while browsing SharePoint site. By default (based on the browser settings) the SharePoint site automatically logs on using current username and password of the user who logged into the system.  We can force to user to enter user name and password by the following way

1. Open internet browser -> Tools -> internet options
2. Click the security tab -> Choose Local Intranet
3. Click Custom level and choose Prompt user name and password which comes under logon in user authentication.

If we choose automatically logs on using current username and password the system does not ask the user credentials. So that user can login in SharePoint site with out entering user credentials.