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...

Fix Windows Security App Not Starting on Windows 11

You click the Windows Security icon or try to open it from Settings, but nothing happens. The app...

Fix Docker Compose Port Already Allocated for PostgreSQL

You run docker-compose up and see an error like "Error starting userland pro...

Fix 'Python Virtual Environment Activate Command Not Found'
When you try to activate a Python virtual environment with source venv/bin/activate ...

Windows 10 Taskbar Icons Not Responding: Practical Fixes
If your Windows 10 taskbar icons stop responding—clicking does nothing, right-click menus don'...

Fix Nginx 502 Bad Gateway in Docker Alpine
You have an Nginx container running on Alpine Linux, and it returns a 502 Bad Gateway. This usual...

Issue queue
Sitemap
Fix Docker Compose Port Already Allocated
How to Resolve Git SSL Certificate 'Unable to Get Local Issuer'
VS Code Save Permission Denied on Mac: How to Fix
DNS Probe Finished NXDOMAIN Fix Guide
Resolving Same-Line Git Merge Conflicts
How to Fix Remote Desktop Error 0x204
Node Engine Check Failure: Causes and Solutions
How to Fix Docker Volume Permission Denied Errors
How to Fix npm Permission Denied After Using Yarn
Fix Windows Explorer Crash Loop After Sign In
Registry Tweaks for 'Windows Cannot Access Shared Folder' Error
Re-Enable Windows Update Service Guide
Desk note

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