ftp instead of http in sources.list

[tburon]

Hello. i have the following lines in sources.list for kubuntu.
# kubuntu.org packages for the latest KDE version (packages, GPG key: DD4D508
deb http://kubuntu.org/packages/kde-latest breezy main

# kubuntu.org packages for the latest Koffice version (packages, GPG key: DD4D508
deb http://kubuntu.org/packages/koffice-latest breezy main

I am behind a firewall and have problems with http repositories, not with ftp repositories, so i change http by ftp in all the ubuntu repositories and all is fine, except for kubuntu.
Do you know if there is another fiable repository in ftp ?.

Thanks in advance.