Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix 'Windows Remote Desktop Cannot Connect to This Computer'
When you see "Remote Desktop can't connect to the computer" after entering the target...
Fix Chrome Certificate Error: Invalid Authority on Company Network
When Chrome displays Your connection is not private with NET::ERR_CERT_AUT...
Windows Security App Not Opening: Practical Fixes
If the Windows Security app won't open—clicking the icon does nothing, or it crashes immediat...
How to Fix Cloudflare 522 Error: Origin Server Timeout
If you see a Cloudflare 522 error, it means your origin server didn't respond in time. This u...
How to Add a Bluetooth Device in Windows 11
Adding a Bluetooth device in Windows 11 is usually straightforward, but sometimes things don'...
Topic paths
Quick titles
Resolve Cloudflare Full Strict Sync ProblemsResolve ERR_CONNECTION_RESET by Resetting Proxy SettingsHow to Fix Windows 11 Update Hanging in Safe ModeGit index.lock Error: Causes and FixesHow to Limit Chrome Tab Memory UsageHow to Resolve Cloudflare 522 on a New ServerError 0x80070005 When Updating Windows – Troubleshooting GuideStep-by-Step Bluetooth Device Setup on Windows 11