Why would an aspx file return 404 ("The page cannot be found")

Why when I access an aspx (e.g., http://www.example.com/foo.aspx - not the real site) through IE6 would I get a 404 Error (i.e., 'The page cannot be found') in IIS6

I've got scripts enabled for the website and I've tried with executables enabled as well.

Here is the full error:

The page cannot be found
The page you are looking for might have been removed, had its name changed, or
is temporarily unavailable. 
------------------------------------------------------------------------------

Please try the following:

Make sure that the Web site address displayed in the address bar of your 
browser is spelled and formatted correctly. 
If you reached this page by clicking a link, contact the Web site 
administrator to alert them that the link is incorrectly formatted. 
Click the Back button to try another link. 
HTTP Error 404 - File or directory not found.
Internet Information Services (IIS)

------------------------------------------------------------------------------

Technical Information (for support personnel)

Go to Microsoft Product Support Services and perform a title search for the 
words HTTP and 404. 
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for 
topics titled Web Site Setup, Common Administrative Tasks, and About Custom 
Error Messages. 

I can get to Default.htm in the same directory, so I know the path is right. I've opened it up to everyone (temporarily) so I know the permissions are right.

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The site is pointing to a different directory where the page is not.

It could be permissions, however I would think you would get an access error instead.

I'm assuming you are running IIS.

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Check that the anonymous user under which the site runs has read access to the file foo.aspx.

IIS6 and later uses a 404 response, thereby not letting an attacker know whether such a file even exists.

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Check that www.example.com is going to the site that you think it is.

If you are hosting multiple sites on the same IP using host headers you may want to double check the name you are using is going to the site you think it is.

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It could be a lot of things. I had this issue today because .NET had not been re-initialized after installing IIS (aspnet_regiis -i -enable or equivalent).

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Ray and Joe probably have it. In order to serve any file type, IIS has to have a mapping for it. Aspx files require that they be mapped to the AspNet ISAPI dll, which the .Net installation normally takes care of. If you install IIS after .Net (and I'm sure there are other situations), you have to initiate this yourself by running aspnet_regiis.

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I just happened to find another culprit for this issue. My foo.aspx page referenced a particular master page that had a <%@ Register %> directive to a user control that did not exist. Removing the reference to the non-existent user control caused my foo.aspx to load instead of 404.

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ALTERNATE SOLUTION (same error perhaps different cause).

I had installed Visual Studio 2008 Pro without SQL Express it, and it caused this same error. Reinstallation of VS2008 with sql express included seemed to have corrected the problem, or perhaps the install took other actions. I did try to register ASP.net numerous times prior but no luck however it is definitely the most probable cause Just posting my experience for those pulling their hair as I was..

Thanks

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I found a solution here. The real catch was using this:

Response.TrySkipIisCustomErrors = true;

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If you register the .NET 4 version of IIS, you may find it's grabbed the registration of the aspx extension. If ASP.NET v4 is prohibited then 404 will be returned

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I had this issue where some customers were reporting the 404.0 and some didn't have the problem at all(same page). I was able to navigate to any of the pages with no problems from my machine. Some customers would refresh and it would go away. I am using .Net 4.5.2 and IIS 7.5.

Looking at the IIS log file I would see:

sc-status sc-substatus sc-win32-status
404 0 2

sc-status.sc-substatus: 404.0 - Not Found
sc-win32-status: 2 - ERROR_FILE_NOT_FOUND
https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx https://en.wikipedia.org/wiki/HTTP_404

I found the problem was I had deployed a new version of the website in which the old version of the website had RouteConfig.cs/FriendlyUrlSetting setup by creating a project using the web forms template. The new version was created using an empty template. So obvious to me now.. no URL routing. Customers had a cache issue with certain pages on their machine(no .aspx extension) and having them clear browser data ultimately fixed the problem.

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I got this issue when I tried using a different drive to host my apps. I ended up moving them to the wwwroot folder because it was working there and I did not have to time figure out why it is not working on the E: drive.

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I had bin oslyn compiler missing. Adding that all worked fine.

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Check for double quote errors. I started getting a 404 on a single page because I accidentally had this:

<asp:TemplateField HeaderText="ImageURL"">

instead of this:

<asp:TemplateField HeaderText="ImageURL">

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