Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Set Node.js Max Heap Size Permanently
If your Node.js process crashes with memory errors like FATAL ERROR: CALL_AND_RETRY_LAST Al...
Cloudflare Origin Certificate Setup Checklist
You've set up Cloudflare but your origin server still shows SSL errors or mixed content warni...
Fix Chrome Access Violation Error Caused by Antivirus
If Chrome suddenly shows an "access violation" error and crashes, your antivirus software...
Fix Python Permission Denied When Installing Packages on Windows
You run pip install somepackage on Windows and get a PermissionError
Fix Chrome Certificate Error: Invalid Authority on Company Network
When Chrome displays Your connection is not private with NET::ERR_CERT_AUT...
Issue queue
SitemapTroubleshooting Cloudflare Error 525 Full Strict
VSCode Breakpoint Not Working? Here's How to Fix It
Conda Not Working in VS Code Terminal
VS Code Git Not Detecting Changes in Workspace: Fixes
How to Fix Nginx Upstream Connection Refused Error
How to Resolve Merge and Rebase Conflicts in Git
Docker Compose Port Conflict: Quick Fix Guide
Fix Source Control Not Showing Changes in VS Code
Bluetooth Not Working on Windows 11 Checklist
How to Fix Docker Access Denied on Apple Silicon Mac
Fix Detached HEAD During Git Rebase
Troubleshoot npm ENOENT Error in React Projects
VSCode Breakpoint Not Working? Here's How to Fix It
Conda Not Working in VS Code Terminal
VS Code Git Not Detecting Changes in Workspace: Fixes
How to Fix Nginx Upstream Connection Refused Error
How to Resolve Merge and Rebase Conflicts in Git
Docker Compose Port Conflict: Quick Fix Guide
Fix Source Control Not Showing Changes in VS Code
Bluetooth Not Working on Windows 11 Checklist
How to Fix Docker Access Denied on Apple Silicon Mac
Fix Detached HEAD During Git Rebase
Troubleshoot npm ENOENT Error in React Projects