Hello,

Trying a completely new install of Scienficiclinux 6 from netboot, using 
ftp.scientificlinux.org/linux/scientific/6x/x86_64/os as the url source, 
and selecting sl-security as one of the repo sources - I get this error:

"Unable to read package metadata. This may be due to a missing repodata 
directory.  Please ensure that your install tree has been correctly 
generated.

failure: repodata/filelists.sqlite.bz2 from sl-security: [Errno 256] No 
more mirrors to try."

It then gives me the option to "Exit Installer" or "Retry".  Clicking on 
Retry gave the same error.

I have successfully installed without selecting sl-security as a repo 
source for install.

Thanks,
Chris