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 listFix Cloudflare Origin Certificate Error After SSL Change
You changed your SSL/TLS setting in Cloudflare (for example, from Flexible to Full or Full Strict...
Fixing Windows Update Error 0x80070005 and SFC Scan Issues
You try to run Windows Update but get error 0x80070005. When you run System File Checker (SFC /sc...
Fixing node-sass Build Failures on macOS
You run npm install and hit a wall: node-sass fails to compile native modules on mac...
Python Virtual Environment Not Activating on Ubuntu: Fixes
You've created a Python virtual environment on Ubuntu, but when you run source venv/bin...
Fix Docker Desktop Engine Stopping Automatically
If Docker Desktop's engine keeps stopping on its own, you'll see a red status bar or a no...
Topic paths
Quick titles
Mac Git: Dealing with Existing Remote OriginGit Lock File Error: Causes and SolutionsWindows Update 0x80070005: Permission TroubleshootingResolve JavaScript Heap Out of Memory in NodeUnderstanding and Fixing Git Unrelated HistoriesFixing node-sass Build Failures on macOSHow to Resolve Python pip Dependency ConflictsNginx 502 Bad Gateway: Upstream Connection Refused Fix