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Latest Troubleshooting Guides

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Troubleshooting

Cloudflare Error 521: Web Server Down Checklist

Cloudflare error 521 means your origin web server refused the connection. This is not a Cloudflar...

Troubleshooting

Renew an Expired Cloudflare Origin Certificate: Step-by-Step

If your Cloudflare origin certificate has expired, visitors will see SSL errors and your server m...

Troubleshooting

How to Fix Node.js Heap Out of Memory Error

You’re running a Node.js script and it crashes with FATAL ERROR: CALL_AND_RETRY_LAST Alloca...


                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Git 'index.lock' File Exists Error on Linux
                                
When working with Git on Linux, you might see an error like:
fatal: Unable to creat...
                            

                        
                    

                    
                    
                        
                            
                            
                                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), ...
                            
                        
                    
                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Nginx Configuration Test Failure in Docker
                                
When you run nginx -t inside a Docker container and get an error, the container usua...



        
            
                
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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.