maybe you have problem whit your rsa and key, and for improve follow the tutorial.
1. make sure openssh-server was installed
root@gilakomputer:~# apt-get install openssh-server
2. and type this commandroot@gilakomputer:~# rm /etc/ssh/ssh_host_* root@gilakomputer:~# ssh-keygen -t rsa -f /etc/ssh/ssh_host_rsa_key root@gilakomputer:~# ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key root@gilakomputer:~# etc/init.d/ssh reload