SSH is enabled by default, however you must have a user account that is configured to use ssh as an access method.
The -application parameter of the security login commands specifies the access method for a user account.
For web:
::> security login create -user-or-group-name admin -application http -authentication-method password -role admin
::> security login create -user-or-group-name admin -application ontapi -authentication-method password -role admin
For ssh:
::> security login create -user-or-group-name admin -application ssh -authentication-method password -role admin
Is it a brand new setup ? Is the lIF setup ? cluster-mgmt or node-mgmt ? What is the output from console for this command:
::> network interface show