I had this same exact problem & tried all of the above suggestions and others in other threads... To no avail. But somewhere, dealing with the Windows firewall, there is a tick box for "Wireless Portable Device(s)"... I'm too lazy to find the instructions right now.. It was the magic key for me. I'll post the link later... I was up til wee hours of the morning trying to solve this issue, and was ready to return (or smash) my CC when I fell upon this solution.
Edit: Control Panel>System and Security Under Windows Firewall, I clicked on "Allow a program through Windows Firewall." I clicked on the Change Settings button in the upper right. Then I checked the box for Wireless Portable Devices.
Copied From: http://www.reddit.com/r/Chromecast/c...tension_tried/
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