The plugin doesn't work, API problemsNot An Issue

Good afternoon. I have a problem and the plugin doesn't work.
He gives this return:

(12:34:43) | UpdateNotice was compiled successfully in 2088ms
(12:34:43) | Unloaded plugin Update Notice v1.2.0 by Psystec
(12:34:43) | Loaded plugin Update Notice v1.2.0 by Psystec
(12:34:43) | [Update Notice] API: Failed to check for RUST updates, if this keeps happening please contact the developer.
Error Code: 521 | Message: <html>
<head><title>521 Origin Down</title></head>
<body bgcolor="white">
<center><h1>521 Origin Down</h1></center>
<hr><center>cloudflare-nginx</center>
</body>
</html>

Grateful for the attention.

Locked automatically