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 Chrome Access Violation Errors After Update

After a Chrome update, some users encounter an 'access violation' error—typically a popup...

Fix Nginx HTTP to HTTPS Redirect Loop Error

You set up an HTTP-to-HTTPS redirect in nginx, but now your browser shows a redirect loop error. ...

How to Fix Cloudflare 521 Error with Firewall Settings

If you see a 521 Web Server Is Down error when visiting your site through Cloudf...

Fix Nginx 502 Bad Gateway on Docker Ubuntu

Fix Microsoft Edge Sync Error 0x80070424

You try to sync your Microsoft Edge data—bookmarks, passwords, settings—but get error 0x80070424....