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

How to Fix UFW Firewall Port Not Open in Ubuntu

You've configured UFW to allow a port (e.g., 8080) but connections still fail. The port appears c...

GitLab Runner Configuration for Pending Jobs: A Troubleshooting Guide

You push a commit, the pipeline triggers, but jobs stay pending indefinitely. Th...

BitLocker Asks for Recovery Key After Reboot: Fixes

You restart your Windows PC, and instead of the usual login screen, BitLocker asks for a recovery...

Fix CMD Service Unavailable Due to Group Policy

Situation

You open Command Prompt and see an error like "Command Prompt has been disabled...

Fix Chrome Proxy Authentication Failed Errors

When Chrome shows 'proxy authentication failed' or 'ERR_PROXY_AUTHENTICATION_FAILED', it usually ...

How to Fix WinRAR Checksum Error in Downloaded Files

You downloaded a file, but when you try to extract it with WinRAR, you get a checksum error. This...