Checklist for Debugging 502 Bad Gateway in Command Prompt
You're working on a web app or API, and you get a 502 Bad Gateway error. The browser just says '5...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation Not Connecting to Server
You try to activate Windows, but you see an error saying it can't connect to the activation serve...
Fix Windows Security Connection Refused Due to Antivirus Blocking
You try to open Windows Security or run a scan, and get a 'connection refused' error. Often this ...
Fix Missing Folders After Outlook Migration
After migrating your mailbox to a new Outlook profile or a different version, you might find some...
How to Fix Windows Defender Version Mismatch on Windows 10
You might see an error saying Windows Defender has a version mismatch, or the app won't open beca...
How to Fix Windows Activation File Locked Error
You might see a Windows activation error saying the license file is locked or can't be written. T...
Topic paths
Quick titles
Fix Microsoft Store Web Access on macOSResolving RDP Error 0x800704cf Due to DNS ProblemsResolve Cloudflare Flexible SSL Redirect LoopsFix Windows Terminal Blank Tab on New TabFix Locked PST File in OutlookResolve SQLite Database Locked Exception in AndroidFix Windows Activation on Ubuntu – ChecklistCommand Prompt Connection Refused: Firewall Troubleshooting