IIS APPLICATION IS UNABLE TO READ WEB.CONFIG ERROR

CAN SOMEBODY PLEASE HELP ME WITH THIS ERROR. Even though i have given all the permission of the folder to Everyone, IIS_IUSRS this error is still occuring. i am not able to understand this problem.

Error :FASTCGI_UNKNOWN_ERROR ErrorCode="Access is denied.(0x80070005)"

SET_RESPONSE_ERROR_DESCRIPTION ErrorDescription="An unknown FastCGI error occurred"

MODULE_SET_RESPONSE_ERROR_STATUS: Warning ModuleName="FastCgiModule", Notification="EXECUTE_REQUEST_HANDLER", HttpStatus="500", HttpReason="Internal Server Error", HttpSubStatus="0", ErrorCode="Access is denied. (0x80070005)", ConfigExceptionInfo=""

DETAILED EXPLANATION OF ERROR: IIS received the request; however, an internal error occurred during the processing of the request. The root cause of this error depends on which module handles the request and what was happening in the worker process when this error occurred. %05

It seems that you are hosting a pyhton application inside IIS. Since IIS works just as a proxy for Fast-cgi application and fast-cgi application was running under the identity of App pool identity. Please ensure your application pool identity(IIS Apppool\apppoolname) have permission to access your application folder and python's folder.

Of course, you could try to set application pool identity to local system to narrow down this issue.

MS process monitor can be used to troubleshooting access denied error.

https://docs.microsoft.com/en-us/sysinternals/downloads/procmon

You can add a filter for "result= access denied" Then it will tell you who and where need to be granted with permission.