Stand Alone service limit on Windows Server 2012r2?

[Jose Nilton Pace]

This error message "A call to "HttpCreateRequestQueue" failed: Cannot create a file when that file already exists" is pretty clear about the problem: There is a conflicting name reservation on that same machine. It doesn't need to be a IW application. Anything can register a URL, stuff installed under IIS or not. 

From the command prompt type:

netsh http show urlacl

And inspect each one of them. Even better:

netsh http show urlacl > UrlReserv.txt

and a file UrlReserv.txt will be created with all the reservations. You can open the file and inspect it later (you may have dozens or even hundreds of url reservations)

If you have detailed http service state, use:
netsh http show servicestate