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

Fix Cloudflare Origin Certificate with Let's Encrypt

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

Fix DNS Probe Finished NXDOMAIN After Changing DNS

After updating your DNS settings—perhaps to use Google Public DNS or Cloudflare—you might see the...

How to Disable Shell Extensions to Stop Explorer Restarting

If File Explorer keeps restarting, crashing, or freezing on its own, a misbehaving shell extensio...

How to Fix Cloudflare Origin Certificate Validation Failed

If you see a "validation failed" error when setting up or using a Cloudflare Origin Certi...

How to Change Git Remote URL with git remote set-url origin

Sometimes you need to change the remote URL of your Git repository — for example, after switching...

How to Set npm Prefix to Avoid Permission Denied Errors