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Hi, this error probably means that the processing instances (EC2, ECS / Fargate, etc.) responding to health check in each AZ are not configured strictly identically. You should compare the configs of those instances in different AZs in all details to see where the discrepancy is.
Hi.This docunent will help you to identify cause of failing healthcheck in other az.
https://repost.aws/knowledge-center/elb-fix-failing-health-checks-alb
404 is page not found. What ever your target group has configured for health check is finding the page in all the good az’s but the page doesn’t exist on the end machine that’s returning 404.
As suggested your instance is setup differently. Check it’s running same configs on the webserver, all the pages exist, the file system has the correct permissions etc.
This is a host issue and not alb issue.
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AWS公式更新しました 10ヶ月前
