Why I cannot connect to Kafka from outside?

Question

I am running kafka on ec2 instance. So amazon ec2 instance has two ips one is internal ip and second one is for external use.

I created producer from local machine,

Answer 1

SSH to your EC2 instance or wheverver you're hosting Kafka.

sudo nano /etc/hosts

Add:

127.0.0.1 localhost

In my case it's:

127.0.0.1 ec2-12-34-56-78.ap-southeast-1.compute.amazonaws.com

Save and exit.