I wanted to accomplish the same thing as the original request, and looked for an answer here, and turned off every firewall and virusprotection to no avail.
Then, I found the following statment regarding IIS express in the microsoft documentation:
"IIS express does not serve requests to a browser on another computer, making its approval easier in corporate environments".
Bottom line - you will have to install IIS (not the delivered IIS express) to get your project to be seen outside your computer.
Hope this is helpfull to other people that are going nuts turning off every security feature on their computer.