> Could not retrieve mirrorlist > http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-10&arch=i386 > error was > [Errno 4] IOError: <urlopen error nonnumeric port: 'port'> > Error: Cannot find a valid baseurl for repo: fedora This may be a dumb question, but did you verify that you can access that url say in a web browser? I can confirm that it is a valid URL and I could open it in firefox. If you can't open it, then you likely need to check your internet or firewall settings.