network proxy authentication error

[Kuti Attila]

Hello,
I've just installed Ubuntu 10.4, and wanted to connect to internet through a proxy. I tried to configure it in "network proxy" in Gnome, but after pressing apply an authentication error comes up, and ask for a password.

What password should I supply? (I cannot see where to supply proxy user-password pair!?)

I tried the password of my account and even that of root. Same error comes up.
I've already changed root's password from default.

Thanks for your help,
Attila
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