Why credentials prompts when accessing to SQL Reporting Services URL?

This is a newly-setup MS SQL 2012. After that, whenever I wanted to access the URL > http://sqlserver01/ReportServer, a dialog box popped up requires me to enter the user name and password; No matter wath user account I entered, be it local user account or domain admin user account, I can't proceed to the next page. I told the settings can be set in the Reporting Services Configuration Manager console, I did made few changes but the result is still the same. Why? Please show in step-by-step.

Thanks in advance.
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lcohanDatabase AnalystCommented:
What OS are you using? you need to go to the IIS admin on the box running that website and change the authentication mode in there.
MezzutOzilAuthor Commented:
This is using MS Windows 2008 R2 server.

Browse to the http://sqlserv01/Reports, when prompted for credentials, type in local administrator with password. After that, grant any designated domain user accounts with content manager.

And this solve the problem.

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