Fix Cloudflare Error 521 After a Server Update
If you see Cloudflare error 521 after updating your server, the origin web server is refusing the...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix VS Code Source Control Not Detecting Changes After Branch Switch
After switching branches in Git, VS Code's Source Control view sometimes stops showing change...
Fix DNS Probe Finished NXDOMAIN Error in Windows 10
When you see "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome or other browsers, it means the DNS ...
Fixing Cloudflare 522 Errors with Load Balancer Setup
If you see a Cloudflare 522 error, the connection between Cloudflare and your origin server timed...
How to Turn On Bluetooth in Windows 11: Quick Fixes
You open Quick Settings, click the Bluetooth icon, and nothing happens—or the toggle is grayed ou...
How to Fix Cloudflare 521 Error with Firewall Settings
If you see a 521 Web Server Is Down error when visiting your site through Cloudf...
Topic paths
Quick titles
Troubleshooting Nginx Upstream Connection Refused in DockerTroubleshooting Docker Pull Credential ErrorsWindows Taskbar Icons Disappeared – How to RestoreHow to Fix 522 Connection Timeout in Nginx0x800f081f Error: Windows 10 Update Troubleshooting GuideGit Push Rejected: Non Fast-Forward Fix GuideRouter DNS Configuration for NXDOMAIN ErrorHow to Turn On Defender Real-Time Protection Using Group Policy