VS2017 RC - The following error occurred when trying to configure IIS Express
<p>Installed VS2017 RC - Started New Project ASP.NET Core Web Aplication(.Net CORE), selected Individual User Accounts as Authentication type. Try to run code generated with no changes and got the following error: Error occurred when trying to configure IIS Express for project... Error: ../.vs/config/applicationhost.config Error: cannot write configuration file</p>

<p>Looked at that file and it appears that it should have been writable.</p>

<p>FYI using VS2015 Update 3 everything builds and runs as expected including IIS Express.</p>