Spanish internet service providers are blocking access to the No-IP dynamic DNS service with an HTTP error code 451. The error is usually shown when sites are taken down due to legal reasons.
It's probably LaLiga-related antipiracy enforcement, as usual
ISP Blocking of No-IP's Dynamic DNS Enters Week 2 * TorrentFreak
Spanish ISPs blocked No-IP's dynamic DNS service over a week ago. For local users, artificial disruptions like these are part of everyday life.

(torrentfreak.com)