how to fix ALB 502 error

Question

ALB is giving me `502` errors randomly during the playwright test. When I debugged and checked ALB logs in Athena and I found `elb_status_code` is `502`

Also access log entry says, the `request_processing_time` is 0.0, the `target_processing_time` is 0.005, and the `response_processing_time` is `-1`.

As per this AWS documentation: https://aws.amazon.com/premiumsupport/knowledge-center/elb-alb-troubleshoot-502-errors/

```
If the elb_status_code is "502" and the target_status_code is "-", then your load balancer is the source of the HTTP 502 errors
```

But I didn't understand a way to fix it. Can someone please help me with it?

Answer

What is your target? Have you tested the targets independent of the load balancer to ensure they are working fine? Also have you configured health checks on each of the targets?

how to fix ALB 502 error

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