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 notesFix pnpm Install Failures in CI/CD Pipelines
When pnpm install fails in your CI/CD pipeline, it usually stops the build. The error messages va...
Fix PowerShell Permission Denied in VS Code
When you try to run a PowerShell script in VS Code and get a "permission denied" error, i...
Fix ERR_CONNECTION_RESET Caused by Chrome Extensions
If Chrome suddenly shows ERR_CONNECTION_RESET on sites that used to work, a misb...
How to Reinstall Windows Security App (Microsoft Defender)
If the Windows Security app (Microsoft Defender) is missing, crashing, or not opening, reinstalli...
Fix Windows 11 WiFi No Internet Due to Antivirus Blocking
If your Windows 11 PC shows full WiFi bars but no internet access, your antivirus might be blocki...
Issue queue
SitemapHow to Fix npm ENOENT package.json Not Found on Mac
Troubleshooting Cloudflare 521 Web Server Down
Git Merge Conflict Permission Denied Fix Guide
Fix Cloudflare Wildcard Subdomain DNS Propagation Delay
Windows 11 Installation Assistant Hangs at 99% Fix
Docker Compose .env File Not Working
Fix Nginx 502 Bad Gateway in Docker Containers
macOS Git SSL Certificate Problem Troubleshooting
Fix Cloudflare Origin Certificate Chain Errors
Resolve DNS Probe Finished NXDOMAIN Error in macOS
Docker Container Exits Immediately on Linux: Fixes
Fix Corrupt Windows Search Index Database
Troubleshooting Cloudflare 521 Web Server Down
Git Merge Conflict Permission Denied Fix Guide
Fix Cloudflare Wildcard Subdomain DNS Propagation Delay
Windows 11 Installation Assistant Hangs at 99% Fix
Docker Compose .env File Not Working
Fix Nginx 502 Bad Gateway in Docker Containers
macOS Git SSL Certificate Problem Troubleshooting
Fix Cloudflare Origin Certificate Chain Errors
Resolve DNS Probe Finished NXDOMAIN Error in macOS
Docker Container Exits Immediately on Linux: Fixes
Fix Corrupt Windows Search Index Database