无法从其他设备访问Ubuntu Web服务器

I run the built-in PHP web server on Ubuntu 12.04:

php -S 0.0.0.0:8000

Locally, I can access my website on http://192.168.xx.yy:8000. However, I can not access the site from other devices in the same LAN on that same IP-address (the request times out).

I thought the Ubuntu firewall might be blocking the request and did:

sudo uwf disable

and

sudo iptables -F

but still no luck accessing my site form other devices. Does anyone have a clue on this?