Register Privatelink Endpoint IPs as Target for Network Load Balancer

Question

Hello Community, I am registering the IPs of Privatelink Endpoint as target for Network Load Balancer. The security group for Privatelink Endpoint has ingress rule to accept traffic from the VPC CIDR. Reachability analyzer shows that NLB network interface can reach Privatelink. But, when I register the IPs of Privatelink Endpoint (obtained from Endpoint console, selecting the correct Endpoint, IPs from Subnets in pane below) in a Target Group for the Network Load Balancer, the health status shows as unhealthy. Enter image description here

Has anyone encountered such an issue before or has any guidance for me?

Adding details

In Account A NLB --> Privatelink Endpoint

In Account B Privatelink Endpoint Service --> NLB --> EC2 Instance running httpd service

In Account A, under Privatelink Endpoint I see Status Available under Details

Enter image description here

In Account A, this is the Security Group associated with the Privatelink Endpoint Enter image description here

In Account A, health check for IP target group is setup like Enter image description here

In Account B, under Endpoint services I see Endpoint connections Enter image description here

Using the load balancer in account B, I can query the httpd service running on EC2 instance in same account (account B)

h-5.2$ curl -v my-nlb-vpce-9fd09754b3184e1d.elb.REGION.amazonaws.com
*   Trying 192.168.172.46:80...
* Connected to my-nlb-vpce-9fd09754b3184e1d.elb.REGION.amazonaws.com (192.168.172.46) port 80 (#0)
> GET / HTTP/1.1
> Host: my-nlb-vpce-9fd09754b3184e1d.elb.REGION.amazonaws.com
> User-Agent: curl/8.0.1
> Accept: */*
>
< HTTP/1.1 200 OK
< Date: Wed, 05 Jul 2023 08:36:14 GMT
< Server: Apache/2.4.56 (Amazon Linux)
< Last-Modified: Tue, 04 Jul 2023 22:47:22 GMT
< ETag: "30-5ffb110f96f98"
< Accept-Ranges: bytes
< Content-Length: 48
< Content-Type: text/html; charset=UTF-8
<
<html><body>My first EC2 instance</body></html>
* Connection #0 to host my-nlb-vpce-9fd09754b3184e1d.elb.REGION.amazonaws.com left intact
sh-5.2$

Accepted Answer

I have never configured PrivateLink as a target for NLB, is the health check setting the correct setting?  
For example, is the port number correct?

Can PrivateLink be used without going through NLB in the first place?

Answer

Are you using endpoint services? Wondering if this relates to it: https://docs.aws.amazon.com/vpc/latest/privatelink/configure-endpoint-service.html

Answer

```
Availability Zone names in a customer account might not map to the same locations as Availability Zone names in another account. For example, the Availability Zone US-EAST-1A might not be the same Availability Zone as US- EAST-1A for another account. An endpoint service gets configured in Availability Zones according to their mapping in a customer’s account.
```

https://docs.aws.amazon.com/whitepapers/latest/aws-privatelink/deploying-aws-privatelink.html

https://docs.aws.amazon.com/prescriptive-guidance/latest/patterns/use-consistent-availability-zones-in-vpcs-across-different-aws-accounts.html

Register Privatelink Endpoint IPs as Target for Network Load Balancer

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