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If having trouble installing because of missing 32 bits libs in a 64 bits system, here is a very unclean way to fix it, but it works:

compat-libstdc++-33-3.2.3-i386
rpm --force -ivh ftp://rpmfind.net/linux/centos/5.11/os/i386/CentOS/compat-libstdc++-33-3.2.3-61.i386.rpm

glibc-devel-2.5-12-i386;

rpm --force --nodeps -ivh ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/glibc-devel-2.5-123.i386.rpm

glibc = 2.5-123 is needed by glibc-devel-2.5-123.i386
rpm --force --nodeps  -ivh ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/glibc-2.5-123.i686.rpm
glibc-common = 2.5-123 is needed by glibc-2.5-123.i686
rpm --force --nodeps -ivh ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/glibc-common-2.5-123.i386.rpm

        glibc-headers = 2.5-123 is needed by glibc-devel-2.5-123.i386
rpm --force --nodeps -ivh  ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/glibc-headers-2.5-123.i386.rpm


libaio-0.3.106-i386;

rpm --force --nodeps -ivh ftp://rpmfind.net/linux/centos/5.11/os/x86_64/CentOS/libaio-0.3.106-5.i386.rpm

libgcc-4.1.1-i386

rpm --force --nodeps -ivh ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/libgcc-4.1.2-55.el5.i386.rpm

libstdc++-4.1.1-i386;

rpm --force --nodeps -ivh ftp://fr2.rpmfind.net/linux/centos/5.11/os/i386/CentOS/libstdc++-4.1.2-55.el5.i386.rpm

real fix (thanks to Guillaume):
   cd $REPOS_HOME/installers/
   for FILE in `find . -name refhost.xml | grep linux64`; do sed -i.bak 's/i386/i686/g' $FILE ; done

Linux

redirect error to dev null

command arg1 arg2 2>/dev/null

Turn password expiration for a user

chage -I -1 -m 0 -M 99999 -E -1 username