F14 -> F15: preupgrade fails

[sean darcy]

Running F14, did yum upgrade, but can't use preupgrade to upgrade to F15:


preupgrade-cli "Fedora 15 (Lovelock)"
Loaded plugins: blacklist, langpacks, whiteout
No plugin match for: rpm-warm-cache
No plugin match for: remove-with-leaves
No plugin match for: auto-update-debuginfo
Adding en_US to language list
Loaded plugins: langpacks, presto, refresh-packagekit
Adding en_US to language list
preupgrade-main (mirrorlist)
   url: 
http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-15&arch=$basearch
   now: 
http://mirrors.fedoraproject.org/mirrorlist?repo=fedora-15&arch=x86_64
preupgrade (mirrorlist)
   url: 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/15/Fedora/$basearch/os/
   now: 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/15/Fedora/x86_64/os/
Could not retrieve mirrorlist 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/15/Fedora/x86_64/os/ 
error was
14: HTTP Error 503 : 
http://mirrors.fedoraproject.org/mirrorlist?path=pub/fedora/linux/releases/15/Fedora/x86_64/os/ 

Error: Cannot find a valid baseurl for repo: preupgrade

???

sean