<p>I have IIS 5.1 installed on Windows XP Pro SP2. Besides I have installed VS 2008 Express with .NET 3.5. So obviously IIS is configured for ASP.NET automatically for .NET 3.5</p>

<p>The problem is whenever I access <a href="http://localhost" rel="noreferrer">http://localhost</a> IE &amp; Firefox both presents authentication box. Even if I enter Administrator user and its password, the authentication fails. I have already checked the anonymous user access (with IUSR_ user and password is controlled by IIS) in Directory Security options of default website.</p>

<p>However other deployed web apps work fine (does not ask for any authentication).</p>

<p>In IE this authentication process stops if I add <a href="http://localhost" rel="noreferrer">http://localhost</a> in Intranet sites option.</p>

<p>Please note that the file system is FAT32 when IIS is installed.</p>

<p>Regards,
Jatan</p>

[{'answer_id': 53471, 'author': 'Gulzar Nazim', 'author_id': 4337, 'author_profile': 'https://Stackoverflow.com/users/4337', 'pm_score': 3, 'selected': False, 'text': '<p>It could be because of couple of Browser settings. Try with these options checked..</p>\n\n<p>Tools > Internet Options > Advanced > Enable Integrated Windows Authentication (works with Integrated Windows Authentication set on IIS)</p>\n\n<p>Tools > Internet Options> Security > Local Intranet > Custom Level > Automatic Logon</p>\n\n<p>Worst case, try adding localhost to the Trusted sites.</p>\n\n<p>If you are in a network, you can also try debugging by getting a network trace. Could be because of some proxy trying to authenticate.</p>\n'}, {'answer_id': 53488, 'author': 'Hafthor', 'author_id': 4489, 'author_profile': 'https://Stackoverflow.com/users/4489', 'pm_score': 5, 'selected': True, 'text': "<p>This is most likely a NT file permissions problem. IUSR_ needs to have file system permissions to read whatever file you're requesting (like /inetpub/wwwroot/index.htm).<p>If you still have trouble, check the IIS logs, typically at \\windows\\system32\\logfiles\\W3SVC*.</p>\n"}, {'answer_id': 285510, 'author': 'Community', 'author_id': -1, 'author_profile': 'https://Stackoverflow.com/users/-1', 'pm_score': -1, 'selected': False, 'text': '<p>What worked for me is ,,,</p>\n\n<p>Click Start>control panel>Administrative Tools>Internet Information Services</p>\n\n<p>Expand the left tree, right-click your WebSite>Properties</p>\n\n<p>Click on Directory Security, then in "Anonymous access and authentication control" click on Edit</p>\n\n<p>Enable Anonymous access>browse> enter the credentials of the admin (like Administrator) (check names),> Click OK</p>\n\n<p>Apply the settings and it should work fine.</p>\n'}, {'answer_id': 359723, 'author': 'Community', 'author_id': -1, 'author_profile': 'https://Stackoverflow.com/users/-1', 'pm_score': 4, 'selected': False, 'text': '<p>IIS uses Integrated Authentication and by default IE has the ability to use your windows user account...but don\'t worry, so does Firefox but you\'ll have to make a quick configuration change.</p>\n\n<p>1) Open up Firefox and type in about:config as the url</p>\n\n<p>2) In the Filter Type in ntlm</p>\n\n<p>3) Double click "network.automatic-ntlm-auth.trusted-uris" and type in localhost and hit enter</p>\n\n<p>4) Write Thank You To Blogger</p>\n\n<p>As Always, Hope this helped you out.</p>\n\n<p>This was copied from <a href="http://forums.codecharge.com/posts.php?post_id=81959" rel="noreferrer">link text</a></p>\n'}, {'answer_id': 986328, 'author': 'SillyMonkey', 'author_id': 88600, 'author_profile': 'https://Stackoverflow.com/users/88600', 'pm_score': 0, 'selected': False, 'text': "<p>If you want authentication try domainname\\administrator as the username.</p>\n\n<p>If you don't want authentication then remove all the tickboxes in the authenticated access section of the direcory security > edit window.</p>\n"}, {'answer_id': 14333764, 'author': 'Saw', 'author_id': 452748, 'author_profile': 'https://Stackoverflow.com/users/452748', 'pm_score': 0, 'selected': False, 'text': '<ol>\n<li>Add Admin user with password</li>\n<li>Go to wwwroot props</li>\n<li>Give this user a full access to this folder and its children</li>\n<li>Change the user of the AppPool to the added user using this article\n<a href="http://technet.microsoft.com/en-us/library/cc771170(v=ws.10).aspx" rel="nofollow">http://technet.microsoft.com/en-us/library/cc771170(v=ws.10).aspx</a></li>\n<li>Change the User of the website using this article\n<a href="http://techblog.sunsetsurf.co.uk/2010/07/changing-the-user-iis-runs-as-windows-2008-iis-7-5/" rel="nofollow">http://techblog.sunsetsurf.co.uk/2010/07/changing-the-user-iis-runs-as-windows-2008-iis-7-5/</a>\nPut the same username and password you have created at step (1).</li>\n</ol>\n\n<p>It is working now  congrats</p>\n'}, {'answer_id': 27482575, 'author': 'Bobs', 'author_id': 779408, 'author_profile': 'https://Stackoverflow.com/users/779408', 'pm_score': 1, 'selected': False, 'text': '<p>It is easier to remove the "Default Web Site" and create a new one if you do not have any limitations.</p>\n\n<p>I did it and my problem solved.</p>\n'}]
['https://Stackoverflow.com/questions/53464', 'https://Stackoverflow.com', 'https://Stackoverflow.com/users/959/']