I had the same problem when I tried to create output port in sub-processor group. 
I have to create output port in root processor group and link from sub-processor group to this port.

On Nov 24, 2015, at 8:25 AM, Aurélien DEHAY <aurelien.dehay@zorel.org> wrote:

Hello.

I've configured my nifi to use 2 Way SSL for user authentication, without cluster.

I want to create an output port to send data to Spark.

Nifi complains that "output connection for port is not defined". 

How, and where, do I configure that port? I did not find any information about this configuration.

Thanks for any pointer.
Aurélien.