I spent a ton of time figuring this out today. We're in the process of moving from Windows to Macos and this makes .Net dev work a ton easier on Mac. Hope this helps!

Assumptions made for this tutorial:

• VMWare Fusion 8
• Windows 10 VM
• IIS Express/Visual Studio project

Steps

• Make sure in your VM's Settings under Network Adapter is configured to share the ip of the VM with the host computer
• Add an inbound rule to the Windows firewall allowing connections from the port your project starts on
• Run ipconfig in CMD and get the ipv4 address of the Windows box
• Go to $projectDirectory > (this is a hidden folder) .vs > config > applicationhost.config and edit anywhere it says localhost to the ip you copied
• Instead of using localhost:$port you can use ip:$port!

Done!