ssh public key

I just got my mac pro so i am trying to setup a NX client. However i error in authentication due to the pubic key. It worked on my old system. But the difference is that on that system when i went into terminal and went ssh roor@192.168.1.6 for the first time it offered to download the key. This time it did not. How do I go about getting the key? I still have access to the old system.

EDIT: well i found out where to delete any keys so it asked to add that host no change here is the error log when connecting to it via the NX client:

Code:

NX> 203 NXSSH running with pid: 1452
NX> 285 Enabling check on switch command
NX> 285 Enabling skip of SSH config files
NX> 285 Setting the preferred NX options
NX> 200 Connected to address: 192.168.1.6 on port: 22
NX> 202 Authenticating user: nx
NX> 208 Using auth method: publickey
NX> 204 Authentication failed.

Any ideas?

 

Yeah its on a new mac pro not a laptop. Anyway, I don't remember ever needing to copy keys around. Also just typing ssh root@192.168.1.6 then i type the password and I get to the prompt just fine. Well I will still look into the key thing though.