Hey there,
EUGameHost operates with premium Path.net DDoS protection/routing. This is a 17Tbps anycast network and is outright one of the best game DDoS protection solutions in existence. Sadly a downside of an anycast network like Path's is that on opening firewall ports rules can take roughly 30 minutes to propogate to the global PoPs. As a result please if you receive a pop-up when first logging in stating that your firewall has been updated allow 30 minutes before raising a ticekt if you've any connection issues. It will purely be your firewall rules updating.
Thank you.