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

DNS Probe Finished NXDOMAIN: Meaning and Fixes

You're trying to visit a website but Chrome shows "DNS_PROBE_FINISHED_NXDOMAIN". This...

Windows Security App Not Opening as Administrator: Fixes

When you try to open the Windows Security app and it fails to launch, often with no error message...

Fix Cloudflare Origin Certificate Error After SSL Change

You changed your SSL/TLS setting in Cloudflare (for example, from Flexible to Full or Full Strict...

Docker Compose Environment Variable Not Updating? Fix It

Fix ERR_CERT_AUTHORITY_INVALID on Localhost

When testing a local web app, you may see ERR_CERT_AUTHORITY_INVALID in Chrome or si...

Fix 'python' Command Not Found on Windows 10 with Python 3.10

After installing Python 3.10 on Windows 10, you might type python in Command Prompt ...