Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix node-sass Build Failed: node-gyp Rebuild Error
If you see node-sass build failed with node-gyp rebuild in your termina...
Fix Windows Defender Real-Time Protection Not Turning On After Update
After a Windows Update, you might find that Windows Defender's real-time protection is stuck ...
Restore Windows Defender Real-Time Protection After Malware Disables It
If your Windows Defender real-time protection has been turned off and you suspect malware is the ...
How to Change Git Remote URL with git remote set-url origin
Sometimes you need to change the remote URL of your Git repository — for example, after switching...
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...
Issue queue
SitemapResolve Cloudflare SSL Permission Denied Error
Cloudflare 521 Error on Nginx: How to Fix
Cloudflare 522 Error: A Practical Troubleshooting Guide
How to Fix Python UnicodeDecodeError: 'utf-8' Codec Can't Decode Byte
Nginx Configuration Test Failed: Duplicate Listen Fix
Resolving Git SSL Certificate Error: Local Issuer Not Found
Firefox Secure Connection Failed Due to Proxy – Fix Guide
Troubleshoot Windows Update Service for System Restore
Troubleshooting Cloudflare 522: Origin Server Checks
Troubleshooting Chrome Sync Issues with Google Family Link
Chrome Incognito Certificate Authority Error – Quick Fixes
How to Fix 'python' Not Recognized After Reinstalling Python
Cloudflare 521 Error on Nginx: How to Fix
Cloudflare 522 Error: A Practical Troubleshooting Guide
How to Fix Python UnicodeDecodeError: 'utf-8' Codec Can't Decode Byte
Nginx Configuration Test Failed: Duplicate Listen Fix
Resolving Git SSL Certificate Error: Local Issuer Not Found
Firefox Secure Connection Failed Due to Proxy – Fix Guide
Troubleshoot Windows Update Service for System Restore
Troubleshooting Cloudflare 522: Origin Server Checks
Troubleshooting Chrome Sync Issues with Google Family Link
Chrome Incognito Certificate Authority Error – Quick Fixes
How to Fix 'python' Not Recognized After Reinstalling Python