Knowledge base for software setup, errors, and daily tool work.

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...

Apache Service Not Starting on Linux: Troubleshooting Steps

When Apache fails to start on Linux, the service typically exits with an error or hangs. This gui...

FFmpeg Audio Out of Sync: Practical Fixes

You encoded a video with FFmpeg and now the audio is ahead or behind by a fraction of a second. T...

How to Fix '404 Not Found' File Path Errors in CMD

Fix Windows Defender Not Working After Update

After a Windows update, you might find that Windows Defender (Microsoft Defender Antivirus) is di...