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Latest Troubleshooting Guides

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Troubleshooting

Fix NET::ERR_CERT_AUTHORITY_INVALID on Windows 10

You're browsing in Chrome or Edge and see NET::ERR_CERT_AUTHORITY_INVALID. T...

Troubleshooting

Node.js Garbage Collection Tuning to Avoid Heap Out of Memory

If your Node.js process crashes with a FATAL ERROR: CALL_AND_RETRY_LAST Allocation failed -...


                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Cloudflare Error 521 After a Server Update
                                
If you see Cloudflare error 521 after updating your server, the origin web server is refusing the...
                            
                        
                    
                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Windows Update Service Not Running After Clean Boot
                                
If you performed a clean boot to troubleshoot an issue and later found that Windows Update won...
                            
                        
                    
                    
                    
                        
                            
                            
                                Troubleshooting
                                How to Fix Nginx 'Upstream Connection Refused' Error
                                
When Nginx returns a 502 Bad Gateway with upstream connection refused in the error l...
                            
                        
                    
                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Windows 11 WiFi Connected but No Internet After Sleep
                                
You wake your Windows 11 PC from sleep, the WiFi icon shows connected, but you can't load any...



        
            
                
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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.