How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Reset Taskbar Icons in Windows 11: 4 Methods
If your Windows 11 taskbar icons are missing, showing generic file icons, or acting strangely, th...
Chrome Won't Open After Update: Step-by-Step Fix
You updated Chrome, and now it won't open—no window, no error, just nothing. This is a common...
Fix Firefox Secure Connection Failed Due to Proxy Settings
If you see "Secure Connection Failed" in Firefox and suspect a proxy is involved, you'...
Cloudflare 521 Error: Troubleshooting and Fixes
When you see a 521 Web Server Is Down error, it means Cloudflare cannot establis...
Fix npm ENOENT Package.json Not Found & Permission Denied
You run npm install and get a wall of red: ENOENT: no such file or directory, ...
Issue queue
SitemapResolve VSCode Git Permission Denied Error
How to Troubleshoot Docker Network Not Found
How to Resolve Nginx Upstream Connection Refused Error 502
Checklist for Pushing Large Files with Git
Debug React Apps: VS Code Breakpoint Troubleshooting
How to Fix npm run build Dependency Errors
Stuck at 99% Windows 11 Installation Assistant Solution
How to Specify Node Version for a Project
Fix VS Code IntelliSense Not Working in Remote SSH
Handling Large Files Without Memory Error in Python
How to Fix 'Remote Desktop Credentials Did Not Work'
Fix Git 'fatal: refusing to merge unrelated histories' on GitHub
How to Troubleshoot Docker Network Not Found
How to Resolve Nginx Upstream Connection Refused Error 502
Checklist for Pushing Large Files with Git
Debug React Apps: VS Code Breakpoint Troubleshooting
How to Fix npm run build Dependency Errors
Stuck at 99% Windows 11 Installation Assistant Solution
How to Specify Node Version for a Project
Fix VS Code IntelliSense Not Working in Remote SSH
Handling Large Files Without Memory Error in Python
How to Fix 'Remote Desktop Credentials Did Not Work'
Fix Git 'fatal: refusing to merge unrelated histories' on GitHub