How to Fix Cloudflare Error 521: Origin Server Unreachable
If you see Cloudflare error 521, your origin server is not responding to Cloudflare's request...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Cloudflare Origin Certificate with Let's Encrypt
If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...
Fix Nginx Configuration Test Failure from Rewrite Rules
You run nginx -t and get an error. The log points to a rewrite rule. This is common ...
Cloudflare Origin Certificate Setup for Apache
If you use Cloudflare's proxy (orange cloud), you can set up an origin certificate to encrypt...
Fix Chrome Extensions Not Loading Configuration
You install a Chrome extension, configure it carefully, and then—nothing. The extension icon is g...
Fix Git Push Rejected Non Fast Forward Force
You try to push your local commits to a remote repository and get an error like ! [rejected...
Issue queue
SitemapFix VSCode Git Authentication Failed on Windows
Resolve Windows Shared Folder Credential Problems
Yarn Permission Denied in VS Code: Quick Fixes
How to Set Up a Wildcard Subdomain DNS Record in Cloudflare
Windows 11 Feature Installation Error 0x800f081f Fix
Troubleshooting Permission Denied for pip install -r requirements.txt
How to Resolve Git Merge Conflicts on the Same Line
Windows 10 Chrome ERR_CONNECTION_RESET Troubleshooting Guide
How to Reset Network Settings in Windows 11 Offline
Bluetooth Device Not Found on Windows 11? Try These Fixes
Enable Docker Desktop to Start Automatically on Windows 11
Reduce Chrome RAM Usage: Step-by-Step Fix
Resolve Windows Shared Folder Credential Problems
Yarn Permission Denied in VS Code: Quick Fixes
How to Set Up a Wildcard Subdomain DNS Record in Cloudflare
Windows 11 Feature Installation Error 0x800f081f Fix
Troubleshooting Permission Denied for pip install -r requirements.txt
How to Resolve Git Merge Conflicts on the Same Line
Windows 10 Chrome ERR_CONNECTION_RESET Troubleshooting Guide
How to Reset Network Settings in Windows 11 Offline
Bluetooth Device Not Found on Windows 11? Try These Fixes
Enable Docker Desktop to Start Automatically on Windows 11
Reduce Chrome RAM Usage: Step-by-Step Fix