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

Fix ERR_CERT_AUTHORITY_INVALID in Chrome Incognito Mode

You open Chrome incognito and hit a warning: NET::ERR_CERT_AUTHORITY_INVALID. Th...

How to Fix Cloudflare 521 Error During Setup

If you see a 521 error after setting up Cloudflare, it means your origin server refused the conne...

Fix Chrome Crash on Startup Due to Hardware Acceleration

If Chrome crashes immediately when you open it, or freezes and becomes unresponsive, hardware acc...

Fix Nginx 403 Forbidden: Permission Denied Errors

You're trying to access a site served by nginx, but you get a 403 Forbidden ...

How to Fix Chrome Sync Not Working with Multiple Profiles

If you use multiple Chrome profiles—say, one for work and one for personal—sync can sometimes sto...

Fix Git SSL Certificate Problem: Unable to Get Local Issuer Certificate