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Troubleshooting

How to Fix Cloudflare 521 Error on Apache Servers

If you see a Cloudflare 521 error, it means Cloudflare’s network cannot reach your origin server....

Troubleshooting

Nginx Redirect Loop: Common Causes and Fixes

You set up a redirect in nginx, but now your browser shows 'redirect loop' or 'too ma...

Troubleshooting

Fix Windows Defender Real-Time Protection Stuck Off in Windows 11

You open Windows Security, see real-time protection is off, click the toggle, and it turns back o...

Troubleshooting

Fix Nginx Upstream Connection Refused in Docker

You have Nginx running, either on the host or in a container, proxying to another Docker containe...

Troubleshooting

Fix Nginx Upstream Connection Refused Socket Error

When Nginx returns a 502 Bad Gateway or logs upstream connection refused


                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix 'port already allocated' for Nginx in Docker Compose
                                
You're starting your Docker Compose setup with Nginx, and you see "port is already alloca...



        
            
                
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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.