Software troubleshooting desk

Practical fixes for tool errors, setup blocks, and workflow issues.

Symptom

Cause

Fix route

Verify

Fresh repair notes

All notes

Nginx Upstream Connection Refused: Diagnosis and Fixes

When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...

Docker Container Exits Immediately After Start: Network Fixes

You start a Docker container and it exits right away. The container logs show no errors, or the e...

How to Resolve Git SSL Certificate Error: Unable to Get Local Issuer

If you see fatal: unable to access 'https://...': SSL certificate problem: unable t...

Fix Nginx Configuration Test Failed on Ubuntu
When you run nginx -t on Ubuntu and get an error, Nginx won't reload or restart....

Fix Cloudflare Wildcard Subdomain and Root Domain Conflict
If you use a wildcard DNS record (e.g., *.example.com) on Cloudflare, you may run in...

Fix VSCode Permission Denied on Save in Linux
You're editing a file in Visual Studio Code, press Ctrl+S, and see a red error: "Failed t...


    Issue queue
Sitemap
Cloudflare 521 Error: Firewall Settings Fix
Fix Cloudflare DNS Propagation for Subdomains
Windows Explorer Keeps Restarting Fix
Troubleshooting Cloudflare 522 Connection Timeout
How to Fix npm ERR! enoent package.json Not Found on Linux
Troubleshooting Cloudflare 522 Behind Load Balancer
Cloudflare SSL Full Strict Not Working? Try These Fixes
Reset Windows Security App Settings Guide
Troubleshooting Docker Overlay Network Not Found
Docker Compose Secret vs Environment Variable: When to Use Each
Windows Security App Won't Open: Fixes That Work
How to Stop Windows Explorer from Restarting After Installing Software
Desk note

    Troubleshooting paths
Home
Windows FixesmacOS HelpBrowser IssuesOffice ToolsDeveloper ToolsCloud SoftwareSecurity ToolsBackup RecoveryNetwork ToolsDatabase ToolsAI ToolsProductivity AppsCLI ErrorsDocker KubernetesEmail ClientsFile Utilities