... access plz???

@iHarrows Get better hosting.

In all seriousness, you can't simply block a DDoS attack as the users doing it use a Botnet which has hundreds of thousands of computers sending traffic to your server. If you want to read up on this, I suggest you go here:

https://www.cloudflare.com/learning/ddos/ddos-mitigation/
https://www.cloudflare.com/learning/ddos/what-is-a-ddos-attack/
https://www.cloudflare.com/learning/ddos/glossary/denial-of-service/

The links above are based on HTTPS traffic, not Call of Duty dedicated servers.