Software troubleshooting desk

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

Symptom

Cause

Fix route

Verify

Fresh repair notes

All notes

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

When testing a local web app, you may see ERR_CERT_AUTHORITY_INVALID in Chrome or si...

Fixing Cloudflare 521 Error: Enable Origin Pull Setup

If you see a Cloudflare 521 error, it means Cloudflare can't connect to your origin server. O...

Fix Wi-Fi No Internet on Windows 11 Without Restarting Router

You connect to Wi-Fi, the icon shows internet access, but browsers say no internet. Restarting th...

How to Fix Nginx Upstream Connection Refused on Port 80

When nginx logs show "upstream connection refused" while connecting to port 80, it means ...

Fix Windows Defender Error 0x800704ec: Real-Time Protection

If you see error code 0x800704ec when turning on Windows Defender real-time protection, the servi...

Fix Chrome Access Violation Error When Opening PDFs

You click a PDF link in Chrome and instead of the document, you see an error: Access Violatio...

Issue queue
Sitemap
Chrome Extensions Not Loading – How to Fix
Node Sass Build Failed: How to Upgrade Node Version
Windows Update 0x80070005: Permission Fix Guide
Fix VS Code IntelliSense Not Working in Workspace
How to Recover Lost Commits from Git Detached HEAD
Troubleshooting Windows Security Configuration Error
Windows Security App Not Working After Update: Fixes
Troubleshooting Nginx Redirect Loops
How to Fix a Stuck Windows 11 Update Using SFC and DISM
Docker Network Not Found But Exists: How to Fix
How to Fix Chrome Black Screen After Turning Off Hardware Acceleration
How to Fix ERR_NAME_NOT_RESOLVED with Google DNS
Desk note

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