If you're still on CentOS 5.7 you might need to upgrade your openssh package. Might I recommend openssh-5.8.p1 with the HPN patch (http://www.psc.edu/networking

If you're still on CentOS 5.7 you might need to upgrade your openssh package. Might I recommend openssh-5.8.p1 with the HPN patch (http://www.psc.edu/networking/projects/hpn-ssh/#patches http://www.psc.edu/networking/projects/hpn-ssh/#patches)