Fix Cloudflare Origin Certificate with Let's Encrypt
If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesCloudflare Origin Certificate Setup Checklist
You've set up Cloudflare but your origin server still shows SSL errors or mixed content warni...
How to Check Node Version Compatibility with a Package
You're about to install or update a package, and you see warnings like "requires Node.js ...
Fix Docker Nginx 502 Bad Gateway Upstream Error
When running Nginx as a reverse proxy in Docker, a 502 Bad Gateway error with 'upstream' ...
Fix Windows 11 WiFi Connected but No Internet After Sleep
You wake your Windows 11 PC from sleep, the WiFi icon shows connected, but you can't load any...
How to Fix Nginx Redirect Loop in Server Block
You set up a server block in Nginx, but now the browser keeps redirecting—http to https, or www t...
Issue queue
SitemapHow to Fix Windows Update Error 0x80070002
Resolve Cloudflare 521 Error on Wildcard Domains
Cloudflare DNS Changes Not Showing: Troubleshooting
How to Fix Chrome Black Screen on Windows 10/11
Taskbar Visible But No Icons – Solutions
How to Resolve Cloudflare 522 Connection Timeout
Fix Nginx Configuration Test Failed: Duplicate Listen Error
How to Fix Pipenv Dependency Version Clashes
How to Reset Microsoft Edge Sync Settings
How to Solve Nginx Permission Denied on Upstream
Fix Node Version Incompatibility with Package
How to Handle UnicodeDecodeError in Python
Resolve Cloudflare 521 Error on Wildcard Domains
Cloudflare DNS Changes Not Showing: Troubleshooting
How to Fix Chrome Black Screen on Windows 10/11
Taskbar Visible But No Icons – Solutions
How to Resolve Cloudflare 522 Connection Timeout
Fix Nginx Configuration Test Failed: Duplicate Listen Error
How to Fix Pipenv Dependency Version Clashes
How to Reset Microsoft Edge Sync Settings
How to Solve Nginx Permission Denied on Upstream
Fix Node Version Incompatibility with Package
How to Handle UnicodeDecodeError in Python