What health checks have been configured on the ALB could you share this?
First of all check your security groups and NACLs that they are allowing traffic. verify that path / is appropriate for the application running behind the ALB Ensure that the target group's protocol and port settings match the protocol and port on which the application is running. Ensure that the target instances behind the ALB are in healthy state. Check the ALB's listeners to make sure that they are correctly configured to route traffic to the target group. verify that the ALB's SSL/TLS settings match the protocol and settings of the target instances. If necessary, enable access logs for the ALB to get more insights into the traffic flow and any potential issues.
for a more detailed methodology see https://repost.aws/knowledge-center/elb-fix-failing-health-checks-alb
Health checks and traffic ports on target groups have different settings.
Please ensure your health check configs have correct protocol http or https and port.
Please can you share your security group for your registered targets.
Also the Instance IP address in your reachabilty screen shot is different than the ones registered in the target group. Is that correct?
Hi, please find the health-check setting: it uses the traffic-port as the health-check port, which is 443 ^^^
Below is the security-group setting that attached to the VPCE PrivateLink: I don't have any egress rule, which I don't think required ^^^
re. IP address mismatch, I have two target groups, pointing to two VPCE, with identical configuration. I may have ran the analyzer on one and paster the screenshot of the other.
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