Fixing Nginx Upstream Connection Refused and Permission Denied
If you see connect() failed (111: Connection refused) or connect() failed (13:...
Software troubleshooting desk
Practical fixes for tool errors, setup blocks, and workflow issues.
Symptom
Cause
Fix route
Verify
Fresh repair notes
All notesFix Cloudflare Origin Certificate with Let's Encrypt
If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...
Fix Docker Container Exits Immediately in Background Mode
You run a Docker container with -d (detached mode) and it exits immediately. The con...
How to Fix Firefox Secure Connection Failed Certificate Error
You see a full-page error in Firefox: Secure Connection Failed with a message li...
How to Fix Git index.lock File Exists Error on Mac
If you're working with Git on a Mac and see the error fatal: Unable to create '/pat...
Fix ERR_CONNECTION_RESET on Specific Websites
ERR_CONNECTION_RESET is a common Chrome error that prevents loading certain websites while others...
Issue queue
SitemapRecover from Git Detached HEAD with Reset Hard
Cloudflare Origin Certificate Setup Checklist
Node Version Mismatch with package.json: Quick Fix Guide
How to Enable Windows Defender Real-Time Protection After Update
Resolve Windows 11 Update Hanging at 0% Progress
Passing Environment Variables to Docker Compose: A Practical Guide
How to Fix RDP Certificate Authentication Errors
Why Cloudflare DNS Changes Aren't Propagating
Fix Docker Desktop Engine Stopped Due to WSL Issue
Troubleshoot Chrome Startup Crash with Extensions Off
Troubleshoot Firefox Secure Connection Warnings
How to Stop Chrome from Eating RAM
Cloudflare Origin Certificate Setup Checklist
Node Version Mismatch with package.json: Quick Fix Guide
How to Enable Windows Defender Real-Time Protection After Update
Resolve Windows 11 Update Hanging at 0% Progress
Passing Environment Variables to Docker Compose: A Practical Guide
How to Fix RDP Certificate Authentication Errors
Why Cloudflare DNS Changes Aren't Propagating
Fix Docker Desktop Engine Stopped Due to WSL Issue
Troubleshoot Chrome Startup Crash with Extensions Off
Troubleshoot Firefox Secure Connection Warnings
How to Stop Chrome from Eating RAM