Use IIS for debugging in visual studio, without an external directory

Question

I've a 64 bits web application(not 32 or any cpu)(because we most of used dll which are needed to be in 64 bit because they are used another process that need at least 5GB of RAM).

I need to debug it in IIS, so I put "Local IIS Web Server" with a Virtual directory.

The problem is that we use CSS files which are used for more than 30 others website, and we have a formal prohibition of making any change in this file. AND they reference ressource in the CSS with "/assets/.../...", so if I put this in a subfolder, all css point to a wrong path(mostly for images).

Is there a way to make that visual studio uses http://localhost:9999(for example?)

Because If I put this, I got an error message when I try to create the virtual directory:

EDIT

If I create the site in IIS, the virtual directory creation works, but when I launch the website, I got an error message of visual studio:(yeah, I changed my mind for the 7777 port, IIS is configured the same): Any idea?

Answer 1

Try to create new site in IIS and set port to 9999, then try again.

More info: Create a Web Site (IIS 7)