421 Service not available.\r\n

nginx

HTTP/1.1 200 OK
Server: nginx
Date: Wed, 26 Feb 2025 17:29:19 GMT
Content-Type: text/html; charset=UTF-8
Content-Length: 615
Last-Modified: Thu, 30 May 2024 06:09:42 GMT
Connection: keep-alive
ETag: "66581826-267"
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
Accept-Ranges: bytes

MariaDB

MariaDB:
  Error Message: Host '224.165.210.22' is not allowed to connect to this MariaDB server
  Error Code: 1130