Summary

A 523 error occurs when Cloudflare fails to reach your web server, indicating a connectivity issue or misconfiguration. This happens because Cloudflare could not resolve the host origin IP address to a valid A record in your DNS settings.

To resolve this problem, you must contact your hosting provider to verify the correct origin IP address they have configured. Upon confirmation, ensure the specific IP associated with the host is included in your Cloudflare DNS settings page under the A record configuration area to restore service connectivity.

Title

regensci.org | 523: Origin is unreachable

Description

regensci.org | 523: Origin is unreachable

Keywords

origin, error, settings, information, working, host, server, website, code, visit, more, browser, madrid, visitor, minutes, owner, check

NS Lookup

A 104.21.53.247, A 172.67.221.30

Dates

Created 2026-04-13

Updated 2026-04-15

Summarized 2026-04-18