Protocols and Ports

For each service you will provide the protocol of the traffic to be balanced (either TCP or UDP) and a pair of ports:

• Service port, the port on which the NLB Service has to listen for the incoming traffic.
• Target port, the port on which the NLB Service has to forward the traffic. This is the port on which the members of the Instance Pool will actually receive the forwarded traffic.

WARNING
Your Instance Pool security groups need to have an open ingress rule on the designated target port to work.