ASP.NET & IIS7 : losing access rights all of a sudden

I'm working locally on an ASP.NET website under Windows 7, and I experience stange behaviours sometimes ...

I've been working several days with several Visual Studio opened, working on the website, the开发者_StackOverflown I switched to compiling and deploying some others apps until yesterday, and today, I had to get back working on the website. So I launched a browser and entered the url "//localhost/" as usual ...

Unexpectedly, IIS tells me :

HTTP Error 500.19 - Internal Server Error

Error Code 0x80070005

Config Error Cannot read configuration file due to insufficient permissions

Config File \?\C:\DVP-WP\SQ2sln_web\web.config

Well, 2 days ago, web.config was accessed without trouble ! What happened? Of cours, I cannot remember having changed anything regarding ACL or accounts or .. just writing c# code and asp.net and compiling !!!

Why does this happen ?

STEP2: So I went to the folder where the website files are located and applied some security: I specify machine\IIS_IUSR to have read access to the folder website folder ("SQ2sln_web") ... OK , II7 now servers the aspx pages I request at the root level ... but not the css file!

HTTP Error 401.3 - Unauthorized

Requested URL [...] localhost:80/soquiz.css

Physical Path C:\DVP-WP\SQ2sln_web\soquiz.css

Logon Method Anonymous

Logon User Anonymous

So I set some specific rights to the file itself (see picture at http://soquiz.com/resources/documents/acl%20problem%20file%20specific.gif)

... but it did not solve the problem

1) Does anyone know WHY or HOW access rights change ?

2) Does anyone know why setting specific acl to one file do not work ?

Thank you!

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I think you need to check the account that your application pool is running under as well.