First generate a public key with the command:
ssh-keygen
then there are two files:
.ssh/id_rsa (your private key)
.ssh/id_rsa.pub (your public key)
Do a:
From your home directory:
chmod og-r -R .ssh
Check the rights of the folder .ssh
it should be xrw------
On the target server
create a folder .ssh
create a file named authorized_keys
In that file paste the content of the file id_rsa.pub
chmod og-r -R .ssh
On most of the configuration this will be enougth, but sometimes you could hae some limitation in the file
vi /etc/security/access.conf
You can allow a specific user to access your server by anabling
+ : youruser ALL
Also you must check that there is no restrictions linked to the domain.
vi /etc/hosts.allow
You should check that there is no restriction on the
sshd: domain
