From now the default ssh daemon and client on hexagon login nodes is openssh with enabled HPN patch (http://www.psc.edu/networking/projects/hpn-ssh/).

This was done primary to allow faster data transfers from and to hexagon. To utilize new opportunities on client side users should use HPN patched OpenSSH version and additional flags.

Please read FAQ.

Update: 04/01 11:27 Switch suspended, meanwhile hpn enabled openssh can be used as before on port 4222.

Update: 13/01 11:00 hpn enabled openssh is now back on port 22, as an default ssh server.