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

Cloudflare Error 521: Web Server Is Down Checklist

If you see Cloudflare error 521 (web server is down), it means Cloudflare cannot establish a TCP ...

Fix "7zip Cannot Open File as Archive" Permission Denied Error

You try to open an archive with 7-Zip and get: "Cannot open file as archive" fol...

Fix Chrome Authentication Failed After Password Change

If you changed your Google Account password and now Chrome says "authentication failed" when tryi...

PowerShell Not Responding When Opening: Quick Fixes

You click PowerShell and nothing happens — or the window opens but immediately freezes. This is a...

Fix SSH Permission Denied (publickey) on Raspberry Pi