Fix Nginx Upstream Connection Refused in Proxy Pass
When Nginx returns a 502 Bad Gateway or logs upstream connection refused
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesHow to Access a Shared Folder on Network in Windows 10
If you're trying to open a shared folder from another computer on your network but get an err...
Docker Pull Access Denied After Login: How to Fix
You run docker pull myimage after logging in with docker login, but get...
Fix Chrome Certificate Error: Invalid Authority SSL Certificate
If Chrome shows 'Your connection is not private' with 'NET::ERR_CERT_AUTHORITY_INVALI...
How to Fix Cloudflare 521 Error During Setup
If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...
Fix Docker Compose Environment Variable Default Value Not Used
You define a default value for an environment variable in your docker-compose.yml file, but when ...
Issue queue
SitemapHow to Restore Missing Taskbar Icons Windows 10
Granting Docker Pull Permissions: Practical Steps
Cloudflare 522 Error: How to Fix CDN Connection Timeout
Best Practices for Windows Search Index
Fix Node.js Heap Out of Memory on Linux Server
Windows 11 WiFi No Internet – Proxy Fix
How to Resolve Nginx 502 Error with Docker and Load Balancer
Enable Breakpoints in VS Code – Step-by-Step Guide
How to Fix Docker Desktop Engine Stopped Error Code 0
Fix Firefox Certificate Error: Secure Connection Failed
Git Detached HEAD: Merge Changes to Master
Fix Nginx 502 Bad Gateway with Docker Environment Variables
Granting Docker Pull Permissions: Practical Steps
Cloudflare 522 Error: How to Fix CDN Connection Timeout
Best Practices for Windows Search Index
Fix Node.js Heap Out of Memory on Linux Server
Windows 11 WiFi No Internet – Proxy Fix
How to Resolve Nginx 502 Error with Docker and Load Balancer
Enable Breakpoints in VS Code – Step-by-Step Guide
How to Fix Docker Desktop Engine Stopped Error Code 0
Fix Firefox Certificate Error: Secure Connection Failed
Git Detached HEAD: Merge Changes to Master
Fix Nginx 502 Bad Gateway with Docker Environment Variables