Checklists for software errors, setup, and tool workflows.

Fix Docker Build Error: 'failed to solve: manifest not found'

You run docker build and get an error like:

failed to solve: error fetching ...

Fix Windows Defender Sync Error 504 Gateway Timeout

If you see a "504 Gateway Timeout" error when Windows Defender tries to sync, it usually means th...

Outlook Autodiscover Not Working: Practical Fixes

When Outlook can't set up your email account automatically, Autodiscover is usually the culprit. ...

Fix Windows Update 502 Bad Gateway Related to Proxy Settings

If you see a "502 Bad Gateway" error when running Windows Update, it often points to a problem wi...

Fix WinSCP Permission Denied Publickey Authentication

When connecting to a remote server with WinSCP using SSH public key authentication, you may see t...

Nginx Permission Denied: A Practical Troubleshooting Checklist

If you see nginx: [emerg] open() "/path/to/file" failed (13: Permission denied) in y...