I've configured gnome-file-share-properties on all my Ubuntu's PC for sharing the directory Public to each other. I following some guide found on Internet for the configuration of it, all explain the same procedure but in my case I don't see any Public directory shared with the PC. Following this link

http://library.gnome.org/users/gnome-user-share/stable/gnome-user-share-getting-started.html.en

I'd see the directory Public plus the name of PC that shares its directory on Nautilus Places.

In my case I don't see anything, therefore on the Network place see all the machines 'n if I try to click on one receive this:

"DBus error org.freedesktop.DBus.Error.NoReply: Message did not receive a reply (timeout by message bus)"

note: I don't want to use Samba because I've all Ubuntu PC, and the firewall is disabled on all PC.