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Editorial Team
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Asked: 2026-06-05T18:26:28+00:00

I’m developing a website for a client of ours and have been having a

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I’m developing a website for a client of ours and have been having a nagging issue for weeks. The problem is intermittent and might happen twice in a day or once in 2 weeks.

When it happens, the client will start getting 401.3 “Unauthorized” errors when trying to load static script or style tags on the page. It’s always a .css or .js file that gets denied and setting <modules runAllManagedModulesForAllRequests="false" /> hasn’t fixed the problem. When the problem happens it effectively blocks the file until the application pool is restarted.

The site is using Forms Authentication with the stock “AspNetSqlMembershipProvider”. The site has protected files in an /Accounts folder, styles in /Styles, and scripts in /Scripts. The site has anonymous access enabled and has a separate web.config in the /Accounts folder which deny’s access to anonymous users (though that shouldn’t even matter with runAllManagedModulesForAllRequests=false).

I’ve looked through the event logs and I see this:
2012-06-06 14:23:32 [ipaddress] GET /subfolder/Styles/Site.css ver=11 443 – [ipaddress] Mozilla/5.0+(Windows+NT+6.1;+WOW64;+rv:12.0)+Gecko/20100101+Firefox/12.0 https://thesitename.net/subfolder/Account/Login.aspx 401 3 5 1493 429 62

Sometimes after a short period of time it fixes itself or if I restart the application pool I get this:
2012-06-06 14:30:30 [ipaddress] GET /subfolder/Styles/Site.css ver=11 443 – [ipaddress] Mozilla/5.0+(Windows+NT+6.1;+WOW64;+rv:12.0)+Gecko/20100101+Firefox/12.0 https://thesitename.net/subfolder/Account/Login.aspx 200 0 0 2533 455 78

I finally got the hosting provider to enable failed request tracing and finally got a trace of the error:
frt

Every failed request tracing file I got this time said the failure happens right after the “FILE_CACHE_ACCESS_END” event. What is this event doing and why would access be denied?

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  1. Editorial Team

    EDIT:

    You should probably try following the “failed request tracing” instructions here. The error is almost certainly NTFS permissions related.

    Looks like you are getting a Win32 “path not found” error in the problem line (the 3 right after the HTTP status code, field sc-win32-status).

    Are these files on a network share? It looks like there might be some connectivity issues between the web server and the drive hosting these files. This might be in the form of an authorization error for the IIS user when attempting to read those files, which would explain the 401 error.

    W3C Extended Log File Format (IIS 6.0) here: http://www.microsoft.com/technet/prodtechnol/WindowsServer2003/Library/IIS/676400bc-8969-4aa7-851a-9319490a9bbb.mspx?mfr=true

    Win32 status codes here: http://msdn.microsoft.com/en-us/library/ms681382.aspx

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