An IIS website may give the following error when trying to browse an ASP.NET website:
Server Error in ‘/website’ Application
The current identity (username) does not have write access to ‘C:\Windows\Microsoft.NET\Framework64\v4.0…\Temporary ASP.NET Files’.
This is because the user listed in the error doesn’t have write permission to the specified direectory. You can fix this by changing the account that the Application Pool for the website is run with, or giving the user write access by adding them to the IIS_IUSRS security group on the web server.