proxy server (isa 2004) problem?

[I M]

after setting up isa 2004 proxy server, eveythng is working fine on the LAN. all workstations can access internet pretty fine. but the problem here is that when if i try to play any movie clip like yahoo movie or Youtube movie an erro screen pops up asking my user name and password. and simply will not play the clip.whats this problem and how do i go about it?

[yewuliang h]

you can try these proxy site:http://www.seconddoor.net/http://www...indow.net/Good Luck !