If the client enabler code is set to no, then this means the client somehow has not been granted a license or unable to retrieve a license.
Please run the command nsrlic -v in order to review your current license allocation status.
If the client connection licenses have been exhausted, here is a temp enabler for 5 client connections
Please note that you will need to contact licensing to aquire the auth codes and proper licenses as per your entitlement.
Licensing may be contacted at (408)566-2000 or firstname.lastname@example.org