Fix Windows Security 502 Bad Gateway Error
If you're seeing a "502 Bad Gateway" error when opening Windows Security (also known as Windows D...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Firefox Secure Connection Failed Errors: Practical Steps
When Firefox displays a 'Secure Connection Failed' error, it usually means the browser cannot ver...
Configure Windows Update to Trust a Custom SSL Certificate
If you manage Windows updates in an enterprise environment, you may need to use a custom SSL cert...
Fix Windows Defender Service Path Not Working
When Windows Defender's service path isn't working, the Security Center may show “Unknown” status...
Fix Windows Security Service Not Running Error
You open Windows Security and see a red banner: “Windows Security service is not running.” Or you...
Fix Windows Activation Version Mismatch Due to Incorrect Edition
You install or upgrade Windows, then see an activation error like “The version of Windows you hav...
Topic paths
Quick titles
Windows Defender File Locked: Quick Troubleshooting ChecklistHow to Fix BitLocker Recovery Key Connection FailureTroubleshooting Windows Search Index and Sync ProblemsFix Antivirus Blocking Windows Update Connection RefusedRemote Desktop Permission Error SolutionsTroubleshoot PowerShell Localhost Firewall BlockMicrosoft Store SSL Certificate Error FixWindows Terminal vs Command Prompt: Which One Should You Use?