Unable to connect to web server ‘IIS Express’
If you get an error message that says Unable to connect to web server ‘IIS Express’, close Visual Studio and then open it by using the Run as administrator option from the right-click or context menu. Then, run the application again.
You might also get a message that asks if you want to accept an IIS SSL Express certificate. To view the code in a web browser, choose Yes, and then choose Yes if you receive a follow-up security warning message.