[CentOS] how to turn off "update info" on /var/log/messages

we have CENTOS 5.3 on DELL server.  This server is inside firewall and it continue get error messages on /var/log/messages:


error getting update info: Cannot retrieve repository metadata (repomd.xml) for repository: base. Please verify its path and try again


anyone know how to turn off it?

Thanks.

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