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

How to Fix Cloudflare Origin Certificate Validation Failed

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

Fix ERR_NAME_NOT_RESOLVED Caused by Antivirus Block

If you see ERR_NAME_NOT_RESOLVED in Chrome, it usually means the browser can'...

Fix Error 0x80070080: Windows Update Reset Permissions

Error 0x80070080 (access denied) during Windows Update usually means the system lacks proper perm...

Fix Windows 11 Installation Assistant Frozen During Update

You launch Windows 11 Installation Assistant to upgrade from Windows 10, but the progress bar sto...

Fix Windows 11 Update Stuck at 0% with Service Not Running

You click Check for updates, see 0% for ages, and maybe an error like 'Windows Update service...

Fix Nginx Upstream Connection Refused Socket Error