I run netsh wlan show drivers
and get the output containing Hosted network supported : Yes
:
Interface name: Wireless Network Connectio
For me, running the ad-hoc network on Windows 8.1, it was two things:
Any IP will allow you to connect, but if you want internet access the static IP should match the subnet from the shared internet connection.
I'm not sure why I couldn't get a longer password to work, but it's worth a try. Maybe a more knowledgeable person could fill us in.