yum update error

when i try to yum update i get error message
root@host [~]# yum update
Gathering header information file(s) from server(s)
Server: CentOS-3 - Addons
retrygrab() failed for:
http://mirror.centos.org/centos/3/ad...rs/header.info
Executing failover method
failover: out of servers to try
Error getting file http://mirror.centos.org/centos/3/ad...rs/header.info
[Errno 4] IOError: <urlopen error >
any idea?

CentOS release 3.7 (Final)
kernel 2.4.21-37.0.1.ELsmp

 

 

 

 

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