SSRS Prompt for username and password in IE

After the successful installation of SQL Sever Reporting Services 2012 or 2008 R2 , you will get constantly prompted with Windows Security dialog box to enter login details. 

It is easy to fix this issue by following these steps:

1. Open Internet Explorer (IE9) and from the tools menu, choose Internet Options:

2. From the Security Tab, choose Local intranet and click on Sites:

3. Click on Advanced button:

4. Type in localhost in Add this website text field and click on Add button (Un-tick the box Require server verification (https:) for all sites in this zone):

All done. If you open your IE again and type in Reporting Services URL, you will no longer be prompted to enter login details.

Source: http://www.soheib.com/technical-knowledge/ssrs-prompt-for-username-and-password-in-ie/