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Fix Nginx 502 Bad Gateway in Docker Containers

An Nginx 502 Bad Gateway error when proxying to a Docker container usually means Nginx cannot rea...

Troubleshooting

Docker Compose Environment Variable Not Set in Dockerfile

You set an environment variable in your docker-compose.yml file, but when you try to...

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Cloudflare SSL Full vs Flexible: Troubleshooting Mixed Content & Errors

If your site shows broken padlocks, mixed content warnings, or SSL errors after changing Cloudfla...

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Fix Nginx Upstream Connection Refused & Upstream Not Found

When you see upstream connection refused or upstream not found in your ...

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Cloudflare 521 Error: Fixing WordPress Connection Issues

If your WordPress site shows a Cloudflare 521 error, it means Cloudflare cannot connect to your o...

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Docker Compose Port Already Allocated: How to Fix

You run docker-compose up and see an error like Error: Port 8080 is already al...



        
            
                
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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.