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Troubleshooting

Cloudflare Error 521: Web Server Is Down Checklist

If you see Cloudflare error 521 (web server is down), it means Cloudflare cannot establish a TCP ...

Troubleshooting

Fix Windows Update Service Stuck on Starting

You open Services.msc, see the Windows Update service status as 'Starting', and it never changes....

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Fix Windows Update Pending File Rename Locked Error

You've seen the error: Windows Update gets stuck on 'pending file rename' or 'locked' status, oft...

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Fix Nginx 'unknown directive server_name' Config Test Error

When running nginx -t to test your configuration, you might see an error like ...


                    
                    
                        
                            
                            
                                Troubleshooting
                                How to Fix Windows Security Not Working on Ubuntu
                                
You're running Ubuntu and see an error that Windows Security isn't working. This usually happens ...
                            
                        
                    
                    
                    
                        
                            
                            
                                Troubleshooting
                                How to Restart Windows Defender Threat Service
                                
If Windows Defender shows a warning like "Threat service has stopped" or "Virus & threat protecti...



        
            
                
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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.