When you use a proxy server, your traffic can be detected as coming via a proxy by sites like Hulu.
If you are running squid3, the you can stop this detection by adding the following lines to your config file
sudo nano /etc/squid3/squid.confAdd the following to the file
request_header_access X-Forwarded-For deny all request_header_access Via deny all
You can now test using a site like http://www.whatismyip.com which should now not detect a proxy.