Troubleshooting

AWS EC2 Cannot Connect

Diagnose an EC2 instance that refuses SSH or application connections.

AWS Lambda Handler Error

Diagnose a Lambda function failing at invocation, timeout, or inside handler code.

CI/CD Pipeline Failed

Triage a failing CI/CD pipeline — build, test, or deploy stage.

DNS Not Resolving

Isolate a DNS resolution failure to the client, the resolver, or the authoritative nameservers.

Docker Troubleshooting

Diagnose containers that exit immediately, images that won't build, and networking failures.

HTTP 502 Bad Gateway

Diagnose a 502 Bad Gateway between a reverse proxy or load balancer and its upstream.

HTTP 503 Service Unavailable

Diagnose a 503 caused by an overloaded, draining, or intentionally unavailable upstream.

Kubernetes Troubleshooting

Step-by-step diagnosis for CrashLoopBackOff, ImagePullBackOff, Pending pods, probe failures, OOMKilled and more.

Linux Troubleshooting

Diagnose a full disk, high CPU load, and high memory usage on a Linux host.

Terraform Troubleshooting

Diagnose and recover from state locks, drift, corrupted state and failed applies.

TLS Certificate Expired

Confirm, diagnose and recover from an expired TLS certificate on a public endpoint.