Based on previous question I asked to this list, we have decided to move from Rhost authetication to an RhostsRSAAuthentication. But I am unable to have this work on and SCO open server. I created the /usr/local/ssh/etc/ssh_known_hosts like it is recomended in the sshd_config and configure the following option in the sshd_config RhostsAuthentication no # # For this to work you will also need host keys in /usr/local/ssh/etc/ssh_known_hosts RhostsRSAAuthentication yes # similar for protocol version 2 HostbasedAuthentication yes #AllowedAuthentications hostbased # RSAAuthentication yes # To disable tunneled clear text passwords, change to no here! PasswordAuthentication yes PermitEmptyPasswords no When I run the sshd in debug, I have the following display: debug1: Client protocol version 1.5; client software version OpenSSH_2.9p1 debug1: match: OpenSSH_2.9p1 pat ^OpenSSH debug1: Local version string SSH-1.5-OpenSSH_2.9p1 debug1: Rhosts Authentication disabled, originating port not trusted. debug1: Sent 768 bit server key and 1024 bit host key. debug1: Encryption type: 3des debug1: Received session key; encryption turned on. debug1: Installing crc compensation attack detector. debug1: Attempting authentication for langevin. Thanks you for your time Benoit