Hi.
When I go through this process, I copy the contents of the IS server's id_rsa.pub file to the target client's authorized_keys file. If ssh is configured correctly on the two systems, then a ssh session from the IS to the client becomes passwordless. Until this happens, DP cannot be installed through ssh. Therefore, I'd like you to verify the steps that you followed to see if such a passwordless session is possible or not.
Regards,
Shishir