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I created a network load balancer(internal) to point to the private servers in the VPC, as per documentation i have done the below steps:

  • Configure Security Groups to allow traffic from Client IP address as well as VPC CIDR Blocks.

But after implementing the above procedure, Target Group says that the private server is unhealthy. Below is my Target Group Config:

Protocol TCP Port traffic port Healthy threshold 3 Unhealthy threshold 3 Timeout 10 Interval 30

Please assist me here

Arjun Balan
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    can you share your security group configuration? As you tag NLB, NLB don't have Security Group but its use the SG of the desired instance. – Adiii Sep 16 '18 at 12:56
  • yes i opened up the inbound rules of private instance SG to 0.0.0.0/0 (port 80), but still no luck..still shows as unhealthy – Arjun Balan Sep 16 '18 at 15:50
  • okay then the check on instance is port occupied, make custom health route if possible in your application, if still looking for futher detail check this blog https://docs.aws.amazon.com/elasticloadbalancing/latest/classic/ts-elb-healthcheck.html – Adiii Sep 16 '18 at 18:07
  • yes got the reason, the web server service was down due to to some reasons. When restarted the service things started working fine. – Arjun Balan Sep 16 '18 at 20:14
  • thats good do the basic operation before you post question...just suggestion ;) – Adiii Sep 17 '18 at 05:48

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