Practical software fixes, setup guides, and tool workflows.

Clear technical guides for everyday software errors, configuration problems, and productivity tools.

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Troubleshooting

Fixing Nginx 502 Bad Gateway in Docker Networks

You have an Nginx container proxying requests to another container (like a PHP-FPM or Node app), ...

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How to Generate a Cloudflare Origin Certificate

If you're using Cloudflare as a reverse proxy, you may want to encrypt traffic between your s...

Troubleshooting

How to Resolve Git Merge Conflicts on the Same Line

You run git merge and get a conflict marker on a single line. The file shows both ve...

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How to Fix Cloudflare 521 Error with Firewall Settings

If you see a 521 Web Server Is Down error when visiting your site through Cloudf...

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Fix Git SSL Certificate Error: Unable to Get Local Issuer

If you see the error fatal: unable to access 'https://...': SSL certificate problem...


                    
                    
                        
                            
                            
                                Troubleshooting
                                Nginx Upstream Connection Refused: Diagnosis and Fixes
                                
When Nginx returns a 502 Bad Gateway or logs "upstream connection refused", it means Ngin...



        
            
                
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                    Support Note
                     Test fixes in a non-critical profile first, keep backups for configuration files, and record exact error messages before changing settings.