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

Fix DNS Probe Finished NXDOMAIN Error in Windows 10

When you see "DNS_PROBE_FINISHED_NXDOMAIN" in Chrome or other browsers, it means the DNS ...

Fix Cloudflare Origin Certificate with Let's Encrypt

If your origin server is rejecting the Cloudflare origin certificate—perhaps because of a SAN mis...

docker compose set environment variable from file

When running Docker Compose, you often need to pass environment variables to your services. Hardc...

How to Fix Cloudflare Error 521: Web Server Is Down

Cloudflare error 521 means your origin web server is refusing the connection from Cloudflare'...

How to Set npm Prefix to Avoid Permission Denied Errors