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 notesWindows 11 Update Stuck at 0%: How to Fix
You start a Windows Update, and the progress bar sits at 0% for ten minutes, an hour, or longer. ...
Fix 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...
How to Fix Git 'index.lock' File Exists Error
When you see fatal: Unable to create 'path/.git/index.lock': File exists., G...
Fix Windows 11 WiFi Connected but No Internet: IPv4 Settings
You see the WiFi icon connected, but websites won't load. The network shows “No internet” or ...
Docker Compose Secret vs Environment Variable: When to Use Each
If you're writing a docker-compose.yml and wondering whether to put a value in <...
Issue queue
SitemapHow to Fix npm ERR! enoent ENOENT: package.json Missing
How to Debug Nginx Syntax Error: Missing Semicolon
Windows Defender Real-Time Protection Fix Guide
Nginx 502 Bad Gateway Docker: Causes and Solutions
Resolving Nginx Redirect Loops from Rewrite Rules
NET::ERR_CERT_AUTHORITY_INVALID in Incognito Mode: Troubleshooting
How to Fix WiFi Connected But No Internet on Windows 11
Docker Swarm Network Not Found Error Fix
Fix Windows Update Error 0x800f081f Stuck or Failing
How to Fix Node Version Mismatch When Running npm run build
Fix Docker Volume Permission Denied for Non-Root User
Windows 11 Blue Screen Driver Update Rollback Guide
How to Debug Nginx Syntax Error: Missing Semicolon
Windows Defender Real-Time Protection Fix Guide
Nginx 502 Bad Gateway Docker: Causes and Solutions
Resolving Nginx Redirect Loops from Rewrite Rules
NET::ERR_CERT_AUTHORITY_INVALID in Incognito Mode: Troubleshooting
How to Fix WiFi Connected But No Internet on Windows 11
Docker Swarm Network Not Found Error Fix
Fix Windows Update Error 0x800f081f Stuck or Failing
How to Fix Node Version Mismatch When Running npm run build
Fix Docker Volume Permission Denied for Non-Root User
Windows 11 Blue Screen Driver Update Rollback Guide