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Latest Troubleshooting Guides

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Troubleshooting

Fix Windows Security Can't Connect to Server Error

When you see "Windows Security cannot connect to the server" while trying to sign in or access a ...

Troubleshooting

Fix Windows Defender Blank Screen in Safe Mode

You boot into Safe Mode to run a malware scan, but Windows Defender shows nothing—just a blank wh...

Troubleshooting

How to Fix Windows Security Connection Refused Error

You open Windows Security and see a "Connection refused" error when trying to update virus defini...

Troubleshooting

Fix Certbot Renewal Failed with ACME Error

If you see a message like Certbot renewal failed with acme error when running ...


                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix 'Permission Denied' Error with Windows Security Offline Installer
                                
When you download the Windows Security offline installer (typically WindowsDefenderOfflineS...

                            

                        
                    

                    
                    
                        
                            
                            
                                Troubleshooting
                                Fix Windows Security Auto Start Registry Settings
                                
If Windows Security (formerly Windows Defender) isn't starting automatically when you boot your P...



        
            
                
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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.