It seem the Auth0 website, at least from here in London (UK)
curl -v https://auth0.com
{ [5 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [238 bytes data]
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
{ [238 bytes data]
* old SSL session ID is stale, removing
{ [5 bytes data]
* Connection state changed (MAX_CONCURRENT_STREAMS == 100)!
} [5 bytes data]
< HTTP/2 525
< date: Tue, 18 Mar 2025 19:30:00 GMT
< content-type: text/html; charset=UTF-8
< cf-ray: 9227245ebcb0cda9-LHR
< cache-control: private, max-age=0, no-store, no-cache, must-revalidate, post-check=0, pre-check=0
< expires: Thu, 01 Jan 1970 00:00:01 GMT
< referrer-policy: same-origin
< x-frame-options: SAMEORIGIN
< x-content-type-options: nosniff
< set-cookie: _cfuvid=O.4isda8zqAqVDXFoAJhP.Sa66PwKnMEaQC0xdi_xx4-1742326200834-0.0.1.1-604800000; path=/; domain=.auth0.com; HttpOnly; Secure; SameSite=None
< server: cloudflare
< alt-svc: h3=":443"; ma=86400
[...]

<h1>SSL handshake failed</h1>
<p>Cloudflare is unable to establish an SSL connection to the origin server.</p>
<ul>
<li>Ray ID: 9227245f06bbcda9</li>
<li>Your IP address: 147.12.130.114</li>
<li>Error reference number: 525</li>
<li>Cloudflare Location: London</li>
</ul>
</div>