Permission denied on Data node thru SSH

Trying to access Data node to check properties. Getting permission denied error.

[sundeept@gw01 ~]$ ssh
The authenticity of host ‘ (’ can’t be established.
RSA key fingerprint is d4:0f:91:fc:2a:4e:05:77:a2:8a:48:29:f1:59:e1:49.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘,’ (RSA) to the list of known hosts.’s password:
Permission denied, please try again.’s password:

You cannot access any other node than using ssh.