How to Fix Cloudflare 521 Error on Apache Servers
If you see a Cloudflare 521 error, it means Cloudflare’s network cannot reach your origin server....
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Git LFS Push Error 403
You're trying to push a large file with Git LFS and get a 403 error. This usually means the s...
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...
Fixing Nginx Upstream Connection Refused on Port 443
You see "upstream connection refused" in your Nginx error log when proxying requests to p...
Fixing node-sass Build Failures on macOS
You run npm install and hit a wall: node-sass fails to compile native modules on mac...
Chrome Certificate Error: Not Secure Site Workaround
You're trying to reach a site and Chrome shows a full-page warning: “Your connection is not p...
Topic paths
Quick titles
Fixing 'Command Not Found' in VS Code TerminalDisable Search Indexing on WindowsRestore Missing Taskbar Icons in WindowsFix Windows Update Error 0x80070002Windows 11 Installation Assistant 99% Hang SolutionResolve pnpm Errors After Updating Node.jsFix VS Code Git Auth Failed with Personal Access TokenGit Detached HEAD Commit Recovery Guide