Yum Error - Metadata file does not match checksum

Ran into this issue today when the pgsql folks updated their repository. All of our CentOS 5 machines are behind a transparent HTTP proxy cache server (squid).

filelists.sqlite.bz2      100% |=========================| 157 kB    00:00     
http://yum.pgsqlrpms.org/8.3/redhat/rhel-5-x86_64/repodata/filelists.sqlite.bz2: [Errno -1] Metadata file does not match checksum
Trying other mirror.
Error: failure: repodata/filelists.sqlite.bz2 from pgdg83: [Errno 256] No more mirrors to try.

It doesn't really matter what the package name is, the primary issue is the "[Errno -1] Metadata file does not match checksum" error message.

Solution:

1) Edit /etc/yum.conf and add the following line

http_caching=packages

2) Run "yum clean metadata"

3) Retry the yum install

References:

FedoraForum.org > Fedora Support > Installation Help > yum "Metadata file does not match checksum" problem