Running a .NET Web Server on AWS

I am not sure the steps I have taken are ok so I will write what I've done:
1) Created a new Windows Server 2012.
2) Moved my .NET web project files into inetpub\wwwroot.
3) With server manager -> added Web Server (IIS) role
4) On IIS Manager added my website with physical path to the project Dir.
5) Set up index.html as my Default Document.

After that I entered my instances public DNS, and got to index.html, but all the API calls from JS, get 500 (Internal server error).

I'm not sure what the problem is, can anyone point me to the right direction?