Software troubleshooting desk

Practical fixes for tool errors, setup blocks, and workflow issues.

Symptom

Cause

Fix route

Verify

Fresh repair notes

All notes

Fix Nginx Upstream Connection Refused in Proxy Pass

When Nginx returns a 502 Bad Gateway or logs upstream connection refused

Fix Chrome ERR_CONNECTION_RESET Due to Proxy Settings
You're browsing in Chrome and suddenly pages won't load, showing ERR_CONNECTION_R...

How to Fix Cloudflare 521 Error Due to Proxy Issues
If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...

Fix 'node-sass build failed python not found' Error
If you see node-sass build failed python not found when running npm install

Fix Git 'index.lock' File Exists Error on Linux
When working with Git on Linux, you might see an error like:
fatal: Unable to creat...

How to Fix Git Unrelated Histories Error When Merging Branches
You try to merge two branches, and Git stops with: fatal: refusing to merge unrelated histo...

Issue queue Sitemap Fix Discord Black Screen from Chrome Hardware Acceleration Cloudflare Full Strict Mixed Content Fix Cloudflare 521 Error: Server Timeout – Causes and Fixes VS Code Debugger Not Hitting Breakpoints in Node.js: Fixes Troubleshoot NGINX SSL Backend Connection Refused How to Fix Edge Sync Stuck on Preparing Sync Cloudflare Wildcard DNS Setup for Multiple Sites Docker Storage Full: Troubleshooting Steps How to Fix a Detached HEAD with Git Reset --hard Windows 11 Blue Screen After Update Fix with SFC Node Sass Build Error: Visual Studio Build Tools Setup How to Fix Bluetooth Issues in Windows 11 Desk note Troubleshooting paths Home Windows FixesmacOS HelpBrowser IssuesOffice ToolsDeveloper ToolsCloud SoftwareSecurity ToolsBackup RecoveryNetwork ToolsDatabase ToolsAI ToolsProductivity AppsCLI ErrorsDocker KubernetesEmail ClientsFile Utilities