Fix Nginx Upstream Connection Refused Socket Error
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listPrevent Git Index Lock File Creation: Practical Fixes
If you see fatal: Unable to create 'path/to/.git/index.lock': File exists., ...
Git Merge Conflict: How to See the Diff Between Versions
When you run git merge and hit a conflict, Git pauses and marks the conflicting file...
Fix Windows Update Error 0x80070005 System Volume Information
When you see Windows Update error 0x80070005 with a reference to System Volume Information, it us...
How to Fix Cloudflare 522 Error (Firewall Blocking)
If you see a Cloudflare 522 error, the connection between Cloudflare and your origin server timed...
Common Causes of Nginx Configuration Test Failure
When you run nginx -t and see an error, it usually means a syntax mistake, a missing...
Topic paths
Quick titles
Fix Git Refusing to Merge Unrelated HistoriesDocker Compose Ports Not Working? Here's How to FixFix Chrome Extensions That Fail to LoadHow to Debug Multi-Root Workspaces in VS CodeRenew an Expired Cloudflare Origin Certificate: Step-by-StepDocker Desktop Permission Denied on Startup FixFix Firefox Secure Connection Failed on WiFi NetworksFixing Git Push Rejected: Non-Fast-Forward