yum list updates error

[Ritika Garg <ritikagarg25@xxxxxxxxx>]

Before doing "yum update" on system which has CentOS5.3, I gave "yum list updates" but the following message comes:
Loaded plugins: fastestmirror
Determining fastest mirrors
Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=x86_64&repo=os error was
[Errno 4] IOError: <urlopen error (110, 'Connection timed out')>
Error: Cannot find a valid baseurl for repo: base

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