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I've recently encountered an error trying to host my asp.net site with IIS. I have found a solution that many swear by.
- Add IIS_IUSRS with Read permission on files in the folder
- Change IIS authentication method to BasicAuthentication
- refresh the website. It will work
There is no problem with your web.config. Your web site runs under a process. In iis you can define the identity of that process. The identity that, your web site's application pool runs as (Network Services, Local System, Etc. ...), should have permission to access and read web.config file.
This updated answer is same as above, but a little longer and simpler and improved.
First of all: you don't have to change any thing in your config file. It's OK. The problem is with windows file permissions.
This problems occurs because your application can not access and read web.config file.
Make the file accessible to IIS_IUSRS group. Just right click web.config and click properties, under security tab, add IIS_IUSRS.
So what is this IIS_IUSRS thing?
Your web site is like an exe file. Just like any exe file, it should be started by a user and it runs according to permissions assigned to that user.
When your site is started in IIS, Application Pool of your web site is associated with a user(Network Services, Local System, Etc. ...) (and can be changed in IIS)
So when you say IIS_IUSRS, it means any user (Network Services, Local System, Etc. ...) that your site is running as.
And as @Seph mentioned in comment below: If your computer is on a domain, remember that IIS_IUSRS group is a local group. Also make sure that when you're trying to find this user check the location it should be set to local computer and not a corporate domain.
Nguồn tham khảo: https://stackoverflow.com/questions/5615296/cannot-read-configuration-file-due-to-insufficient-permissions