Health checks are failing for NLB (Network load balancer)

Question

I used the migration wizard to create a Network Load balanacer. And I noticed that there are no security groups associated with the NLB like there are for classic and application load balancers. So I checked the NLB name in network interfaces to capture the IP addresses and add them the security group for the instances associated with the target group as:

Custom TCP | TCP | 7443 | IP Address

All of the health checks are still failing however. I was just wondering if anybody has some advice on how to set up NLBs?

Thanks in advance!

Just an additional bit of information. I added the IP addresses in CIDR form /32 as they are specific IP addresses. I am at a complete loss on how to fix this issue. — codemonkey1010

Marcin Marcin · Accepted Answer · 2020-11-09T11:48:30

A recommended way is to allow entire VPC CIDR range in your instance's security group.

If you don't want to do this, then you have to use private IP address of the NLB nodes. In the above link with recommendation there is procedure listed how to get these IPs.

Health checks are failing for NLB (Network load balancer)

1 Answers