I have a relay that I want to block and haven't found the answer.
Someone in London is using Google to replay my radio stations and I don't want them to be able to do that because it goes against what I provide for the bands I host.

Do I need to explain myself better?
How do I block a relay server?

so if your server is using ip tables as a firewall, you can block it

https://www.servermania.com/kb/articles/ip-blocking-and-iptables-in-linux/


for firewalld use this command but change out the ip address to the one you want blocked
https://fedoraproject.org/wiki/Features/FirewalldRichLanguage#Handle_rich_rules_with_the_command_line_client

firewall-cmd --permanent --add-rich-rule="rule family='ipv4' source address='192.168.0.11' reject"