Problem with the videostreaming loads

[Guest]

[alvaryts]

Hello, I have a problem with videostreaming and endian. The proxy (I think) is blocking any load from any site with  , like vimeo, youtube, dailymotion, etc..
These websites are not blocked by content filter, in fact, the proxy allows user enter to the site, but I get an error at video load.

Here are some captures from this error

img710.imageshack.us/i/vimeoerror.jpg
img197.imageshack.us/i/daillymotionerror.jpg

I supose the problem is at Cache administration options, but i've increased Maximum object size, and still does not work.

Somebody can help me please?

Regards and thanks.