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

How to Fix Cloudflare 521 Error Due to Proxy Issues

If you see a Cloudflare 521 error, the message usually says something like “Web server is down.” ...

How to Fix Cloudflare Origin Certificate Validation Failed

If you see a "validation failed" error when setting up or using a Cloudflare Origin Certi...

Docker Container Exits Immediately: No Error, Common Fixes

You run docker run and the container starts, then exits within a second. No error me...

Windows 11 Installation Assistant Stuck at 99%: Fixes That Work

You’re upgrading to Windows 11 via the Installation Assistant, and it gets stuck at 99%. The prog...

How to Fix Git Push Rejected: Non-Fast-Forward Merge