[Skunkworks] Forefront Tmg 2010 proxy authentication‏

Hi Skunks, I have a Forefront TMG 2010 Proxy server and a domain controller. I have added a machine (codec) in the internal network that is supposed to authenticate to a server on a public ip. I have opened all the necessary ports and can confirm they are open on the log files. The problem is the machine does not authenticate to the server and has no web proxy capabilities. I have also allowed all traffic from the codec's ip by adding an inbound and outbound rule but doesn't work. Kindly assist on how i would allow this authentication on the Forefront Tmg. Regards Francis