yum update problem

[Guo Yang]

I have updated to xorg-x11 several days ago, everything is fine after I 
added /usr/X11R6/lib to /etc/ld.so.conf and reran ldconfig and restart 
xfs. The nvidia driver from nvidia also works fine. But since then I can 
not update the system using yum anymore due to the error message below:

Gathering header information file(s) from server(s)
Server: Fedora Core 1 rawhide
Server: Fedora Core 1( freshrpms )
Server: Mozilla SeaMonkey Releases
Server: Fedora Core 1 ( xcyborg / bleeding )
Server: Fedora Core 1 ( xcyborg / stable )
Finding updated packages
Downloading needed headers
retrygrab() failed for:
  
ftp://mirrors.kernel.org/fedora/core/development/i386/headers/XFree86-Mesa-libGL-0-4.3.0-64.i386.hdr
  Executing failover method
retrygrab() failed for:
  
ftp://download.fedora.redhat.com/pub/fedora/linux/core/development/i386//headers/XFree86-Mesa-libGL-0-4.3.0-64.i386.hdr
  Executing failover method
failover: out of servers to try
Error getting file 
ftp://mirrors.kernel.org/fedora/core/development/i386/headers/XFree86-Mesa-libGL-0-4.3.0-64.i386.hdr
[Errno 4] IOError: [Errno ftp error] 421 There are too many connected 
users, please try later.

So how can I fix this problem? Thanks for comments.

Guo