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1. Environment Ubuntu Server 10.10 SecureCRT 6 OpenSSH 5.3
2. OpenSSH Installations [codesyntax lang="bash" lines="no" container="pre" tab_width="4"]

$ sudo apt-get install openssh-server openssh-client
$ sudo vi /etc/ssh/sshd_config

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PasswordAuthenitcation, Port 22, Protocol 2,1

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$ sudo /etc/init.d/sshd restart

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3. SecureCRT Configurations [codesyntax lang="bash" lines="no" container="pre" tab_width="4"]

$ ifconfig

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get your ip addr -> myipaddr

Config your SecureCRT :

Protocol : SSH2

Host : myipaddr

Port : 22

Firewall : none

User : someone

Done and start connection
4. Using RSA with SecureCRT SecureCRT -> Tools -> Create Pubkey (OpenSSH format) Upload the public key Identity.pub to server [codesyntax lang="bash" lines="no" container="pre" tab_width="4"]

$ su root
$ cd /root
$ mkdir .ssh; chmod 700 .ssh; cd .ssh;
$ mv /path/to/Identity.pub ./authorized_keys2
$ vi /etc/ssh/sshd_config

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(optional : to only allow ssh2 rsa auth)

Protocol 2

PubkeyAuthentication yes

AuthorizedKeysFile .ssh/authorized_keys2

PasswordAuthentication no

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$ sudo /etc/init.d/sshd restart

[/codesyntax] Use PublicKey when using SecureCRT to connect your server
5. Multi-users with SecureCRT Upload other user's Identity.pub to server [codesyntax lang="bash" lines="no" container="pre" tab_width="4"]

$ sudo echo `cat /path/to/Identity.pub` >> /root/.ssh/tmp
$ sudo echo `cat /root/.ssh/authorized_keys2` >> /root/.ssh/tmp
$ sudo mv -f /root/.ssh/tmp /root/.ssh/authorized_keys2

[/codesyntax] To login with another user, set your default path of SecureCRT connection : SecureCRT -> Global Options -> SSH2 -> PublicKey