totem youtube plugin proxy issue

[marcobra (Marco Braida)]

Binary package hint: totem

Description: Ubuntu 9.10
Release: 9.10

apt-cache policy totem-plugins
totem-plugins:
  Installed: 2.28.2-0ubuntu3
  Candidate: 2.28.2-0ubuntu3
  Version table:
 *** 2.28.2-0ubuntu3 0
        500 http://archive.ubuntu.com karmic-updates/main Packages
        100 /var/lib/dpkg/status
     2.28.1-0ubuntu4 0
        500 http://archive.ubuntu.com karmic/main Packages

I'm on a net using a proxy (squid) to get web access authenticated access.
I have applied system wide proxy setting using the menu System→Preferences→Network Proxy with correct user/passwd authentication in it.

When i try to use the youtube plugin in Totem i can get the video list but i can't view the video due a 407 authentication error

Running totem by terminal i get:

totem
** Message: Error: "http://www.youtube.com/get_video?video_id=SuNprTu5Y5c&t=vjVQa1PpcFMvjyI--okeD6Ec5nzQxqNn-U0bqJzmt-w%3D": Proxy Authentication Required
gstsouphttpsrc.c(1096): gst_soup_http_src_parse_status (): /GstPlayBin2:play/GstURIDecodeBin:uridecodebin0/GstSoupHTTPSrc:source:
407 Proxy Authentication Required

If i unset the proxy System→Preferences→Network Proxy i can get all working...

Thank you