How can I troubleshoot a CloudFront 502 error pointing to an ALB by checking ALB metrics?

By: USER1175
28 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
How can I troubleshoot a CloudFront 502 error pointing to an ALB by checking ALB metrics?
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Monitor ALB metrics like `HealthyHostCount`, `TargetConnectionError`, `HTTPCode_Backend_5XX`, `CPUUtilization`, and `MemoryUtilization` in CloudWatch. Low `HealthyHostCount` indicates backend issues. High `TargetConnectionError` suggests connectivity problems. Elevated `HTTPCode_Backend_5XX` confirms backend errors. High CPU/Memory indicates overload.
Answered on 28 Agustus 2025

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