AsyncEventsDropped: diagnose Lambda async event loss
AsyncEventsDropped counts Lambda async events discarded after age or retry limits. Check throttling, destinations and DLQs, then verify processing recovery.
Troubleshooting. Step-by-step fixes for common production errors on AWS, Kubernetes, Cloudflare, Vercel, Postgres and the rest of a modern stack.
Troubleshooting guides start from a symptom you can see: an error code in the browser, a 504 from a serverless function, a database connection that keeps failing. Each one explains what the error means, the usual causes in order of how often they happen and the fix for each.
They are written for the engineer looking at the problem right now. Every guide shows the commands and code to find the cause, from tailing logs to tracing a slow request, then the change that fixes it and how to confirm the fix held. They cover Cloudflare Workers, Hyperdrive, Vercel functions, Kubernetes, Postgres and the other platforms teams deploy to most, and they say plainly when a problem is a platform limit and not your code. A guide that starts from one exact error message shows that message first, so you can check it matches yours.
How Praxen Inc. works on these platforms: AWS, Cloudflare, Supabase, Railway and Vercel.
More guides
AWS_EMF_ENVIRONMENT: valid values and missing EMF fixes
AWS_EMF_ENVIRONMENT overrides EMF library detection. Check Node, Python and Java values separately, trace stdout or agent delivery, and fix missing metrics.
ChangeMessageVisibility: troubleshoot SQS message timeout errors
ChangeMessageVisibility resets SQS message visibility. Use current receipt handles, bounded timeout extensions and per-entry batch error checks with Lambda.
EC2ThrottledException: fix Lambda EC2 API throttling
EC2ThrottledException means EC2 throttled Lambda initialization. Check VPC state and API activity, distinguish concurrency limits, and verify a safe recovery.
LambdaInsightsExtension: setup and missing metrics fixes
LambdaInsightsExtension is the AWS Lambda Insights layer name. Choose a verified regional ARN, grant collector log permissions, and diagnose missing metrics.
Fix Cloudflare “Error 1102: Worker exceeded resource limits”
Why a Cloudflare Worker returns Error 1102, how to tell a CPU time overrun from a 128 MB memory overrun, and the code and Wrangler changes that fix each.
Kubernetes CrashLoopBackOff: causes and fixes
What CrashLoopBackOff means in Kubernetes, how to read the exit code and events behind it, and the fix for each common cause, from bad config to failing probes.
Fix “remaining connection slots are reserved” in PostgreSQL
Why Postgres refuses new logins with “remaining connection slots are reserved”, how to find who holds the connections, and how to pool and cap them for good.
Fix Prisma “P1001: Can't reach database server”
Why Prisma prints “P1001: Can't reach database server”, how to test the host and port it names, and how to fix private hosts, IPv6, paused databases and URLs.
Fix Railway “Application failed to respond” (502)
Why Railway returns “Application failed to respond” with a 502, how to tell a wrong host, port or target port from a crash or overload, and how to fix each.
Fix Render “Port scan timeout reached, no open ports detected”
Why a Render deploy fails with “Port scan timeout reached, no open ports detected”, how to spot the cause in the logs, and how to bind to 0.0.0.0 on PORT.
Fix Vercel “FUNCTION_INVOCATION_FAILED” 500 errors
Why a Vercel Function returns 500 FUNCTION_INVOCATION_FAILED, how to find the crash in runtime logs, and how to fix throws, missing env vars, files and memory.
How to debug Vercel function timeouts
Debug Vercel FUNCTION_INVOCATION_TIMEOUT 504s: find the slow call with vercel logs and httpstat, fix hangs, set maxDuration and verify on a preview.
Cloudflare Hyperdrive connection errors: causes and fixes
Fix Cloudflare Hyperdrive connection errors: config codes 2008 to 2016, pool exhaustion, connection_refused and stale clients reused across Worker requests.
Cloudflare Workers error 1101: causes and how to fix it
Error 1101 means your Cloudflare Worker threw an uncaught JavaScript exception. Find the exception in logs, match it to its cause, fix it and roll back fast.
How to debug Cloudflare Workers errors: logs, traces and error codes
Debug Cloudflare Workers errors step by step: read 1101 and 1102 codes, enable Workers Logs and source maps, use wrangler tail, DevTools and local traces.