unable to update FC4

[Liloulinx]

I tried to update my laptop by using "Red Hat Network icon Alert". I 
have encontered this problem:

A fatal error is encontered during communication with the server. The message where:

An HTTP error occurred:

URL: http://mirror.phy.olemiss.edu/mirror/fedora/core/updates/4/i386///glibc-2.3.6-3.i686.rpm

Status Code: 404

Error Message: Not Found

Do you know why?
Thanks