Can't login though a terminal window

[twolcrazy]

I have two ReadyNAS storage devices.  I want to check something in the file system which can only be done through a terminal window.  I have turned on ssh, but the client command ssh <readyNAS device URL> -l username always returns "Permission denied (publickey)".  

Does one need to restart the ReadyNAS after turninig on ssh?

I am using an Apple Macbook Pro with OS 10.14.6 (Mojave).  Both ReadyNAS's are up-to-date 6.10.3.  Network is ethernet or wifi.

I am a long time unix/linux user, but do not know much about the system stuff.

Thanks,

John

[StephenB]

You should log in as root (and use the NAS admin password).

Also, make sure you have password authentication enabled in system->settings->ssh.