Fix Windows Activation 502 Bad Gateway via Command Prompt
When you try to activate Windows and see a 502 Bad Gateway error, it usually means the activation...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Security Not Starting Due to Third-Party Antivirus
If Windows Security (formerly Windows Defender) refuses to start or shows a blank screen, a third...
Fix MongoDB Authentication Failed with Role-Based Access Control
You’re trying to connect to MongoDB and getting an authentication error, even though you’re sure ...
Fix Gradle Build: Could Not Find or Load Main Class
When a Gradle build fails with Could not find or load main class, it usually means t...
Fix PowerShell Module Not Found Import Errors
When you run Import-Module in PowerShell and see an error like "The specified mo...
Clear DNS Cache for Windows Update Issues
If Windows Update hangs, fails with error 0x80072ee2, or can't connect to Microsoft servers, a st...
Topic paths
Quick titles
How to Fix Permission Denied for Windows Terminal Config FileTroubleshooting UFW Firewall Port BlockedBrave Browser Sync Not Working on Android: FixesCommon Redis Startup Failures and FixesFix Microsoft Store 504 Error: Step-by-Step for BeginnersWindows Security Offline Installer Not Running FixFix 'Windows Security Blocked This File' ErrorFix Certbot Nginx Plugin Config File Missing Error