Fix: React Native Metro Bundler Failed to Start or Bundle
How to fix React Native Metro bundler errors — unable to resolve module, EMFILE too many open files, port already in use, transform cache errors, and Metro failing to start on iOS or Android.
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Fix: Stripe Webhook Signature Verification Failed
How to fix Stripe webhook signature verification errors — why Stripe-Signature header validation fails, how to correctly pass the raw request body, and how to debug webhook delivery in the Stripe dashboard.
Fix: Vue 3 Reactive Data Not Updating (ref/reactive Not Triggering Re-render)
How to fix Vue 3 reactive data not updating the UI — why ref and reactive lose reactivity, how to correctly mutate reactive state, and common pitfalls with destructuring and nested objects.
Fix: AWS EC2 SSH Connection Refused or Timed Out
How to fix AWS EC2 SSH connection refused or timed out errors — security group rules, key pair issues, sshd not running, wrong username, and network ACL misconfigurations.
Fix: CSS position: sticky Not Working
How to fix CSS position sticky not working — element scrolls away instead of sticking, caused by overflow hidden on a parent, missing top value, wrong stacking context, or incorrect height on the container.
Fix: JavaScript Closure in Loop — All Callbacks Get the Same Value
How to fix the JavaScript closure loop bug where all event handlers or setTimeout callbacks return the same value — using let, IIFE, bind, or forEach instead of var in loops.
Fix: Kubernetes exceeded quota / Pod Stuck in Pending Due to Resource Quota
How to fix Kubernetes 'exceeded quota' errors — pods stuck in Pending because namespace resource quotas are exhausted, missing resource requests, and LimitRange defaults.
Fix: EMFILE Too Many Open Files / ulimit Error on Linux
How to fix EMFILE too many open files errors on Linux and Node.js — caused by low ulimit file descriptor limits, file handle leaks, and how to increase limits permanently.
Fix: Nginx WebSocket Proxy Not Working (101 Switching Protocols Failed)
How to fix Nginx WebSocket proxying not working — 101 Switching Protocols fails, connections drop after 60 seconds, missing Upgrade headers, and SSL WebSocket configuration.
Fix: Python threading Not Running in Parallel (GIL Limitations)
How to fix Python threading not achieving parallelism due to the GIL — when to use multiprocessing, concurrent.futures, or asyncio instead, and what the GIL actually blocks.
Fix: Python multiprocessing Not Working (freeze_support, Pickle Errors, Zombie Processes)
How to fix Python multiprocessing not working — freeze_support error on Windows, pickle errors with lambdas, zombie processes, and Pool hanging indefinitely.
Fix: React.memo Not Preventing Re-renders
How to fix React.memo not working — components still re-rendering despite being wrapped in memo, caused by new object/function references, missing useCallback, and incorrect comparison functions.