yum install zlib zlib-devel pam pam-devel openssl openssl-devel gcc patch
cd /usr/src
wget http://ftp3.usa.openbsd.org/pub/OpenSSH/portable/openssh-4.3p2.tar.gz
tar -xzvf openssh-4.3p2.tar.gz
cd openssh-4.3p2
./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam
mv /etc/ssh/ssh_config /etc/ssh/ssh_config.bk
mv /etc/ssh/sshd_config /etc/ssh/sshd_config.bk
make
make install
service sshd restart
nano /etc/ssh/sshd_config