How to Fix Nginx Upstream Connection Refused on Port 80
When nginx logs show "upstream connection refused" while connecting to port 80, it means ...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Node.js Heap Out of Memory on Linux Server
If your Node.js application crashes on a Linux server with FATAL ERROR: Ineffective mark-co...
Permanently Allow Unrelated Histories in Git Merge
If you've ever tried to merge two Git branches that don't share a common ancestor, you...
Fix Wi-Fi No Internet on Windows 11 Without Restarting Router
You connect to Wi-Fi, the icon shows internet access, but browsers say no internet. Restarting th...
Fix Nginx 502 Bad Gateway with Docker Environment Variables
If you see a 502 Bad Gateway from nginx running in Docker, it usually means ngin...
Fix Chrome Black Screen on Mac: Hardware Acceleration Issue
You open Chrome on your Mac, and the screen goes black—or parts of the page are garbled. This oft...
Issue queue
SitemapSet Node Max Old Space Size Permanently
Windows Security App Crashing? Here's How to Fix
How to Reset Bluetooth in Windows 11
Windows Security Not Opening on Windows 10: Step-by-Step Fix
Fix Cloudflare DNS Propagation for New Domains
Fix pip Error: Externally Managed Environment
Fix Chrome Slow and High Memory Usage
Fix Firefox Secure Connection Failed on Windows 10
pnpm audit fix fails: troubleshooting guide
Fix Remote Desktop Connection Failed Due to Group Policy
Chrome Not Launching After Update: Fix
Fixing Nginx Upstream Connection Refused and Permission Denied
Windows Security App Crashing? Here's How to Fix
How to Reset Bluetooth in Windows 11
Windows Security Not Opening on Windows 10: Step-by-Step Fix
Fix Cloudflare DNS Propagation for New Domains
Fix pip Error: Externally Managed Environment
Fix Chrome Slow and High Memory Usage
Fix Firefox Secure Connection Failed on Windows 10
pnpm audit fix fails: troubleshooting guide
Fix Remote Desktop Connection Failed Due to Group Policy
Chrome Not Launching After Update: Fix
Fixing Nginx Upstream Connection Refused and Permission Denied