How to Fix Cloudflare 521 Error During Setup
If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Fix Cloudflare Error 522 Connection Timed Out
Error 522 appears when Cloudflare can connect to your origin server but the server doesn't re...
How to Fix Cloudflare 521 Error Due to Proxy Issues
If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...
Fix Cloudflare SSL Full Strict Certificate Mismatch Error
If you set Cloudflare SSL/TLS encryption mode to Full (strict) and see a certificate mismatch err...
Windows 11 Update Stuck at 0% Due to Corrupt Files: Fixes
You start a Windows 11 update, and it hangs at 0% for minutes or hours. Corrupt system files are ...
Cloudflare Wildcard Subdomain Troubleshooting Checklist
When you set up a wildcard DNS record (e.g., *.example.com) in Cloudflare, subdomain...
Issue queue
SitemapTroubleshooting Cloudflare DNS Propagation Delays
Nginx Redirect Loop: Server Block Fix
Fixing Nginx Upstream Connection Refused and Permission Denied
Permission Error After Upgrading pip: Solutions
Troubleshoot 502 Bad Gateway in Docker Nginx
Fix Windows 11 Blue Screen After Update with Recovery Environment
Fix Node Sass Build Failed: Reinstall Steps
Fix Externally-Managed-Environment Error: Use Virtual Environment
Resolve npm Install Permission Errors Caused by Yarn
Troubleshooting Git SSL Certificate Verification Failure
VS Code Git Not Seeing Changes After Saving Files
pip Externally Managed: How to Bypass Safely
Nginx Redirect Loop: Server Block Fix
Fixing Nginx Upstream Connection Refused and Permission Denied
Permission Error After Upgrading pip: Solutions
Troubleshoot 502 Bad Gateway in Docker Nginx
Fix Windows 11 Blue Screen After Update with Recovery Environment
Fix Node Sass Build Failed: Reinstall Steps
Fix Externally-Managed-Environment Error: Use Virtual Environment
Resolve npm Install Permission Errors Caused by Yarn
Troubleshooting Git SSL Certificate Verification Failure
VS Code Git Not Seeing Changes After Saving Files
pip Externally Managed: How to Bypass Safely