
Hi @Alz99
A few suggestions:
1) Shutdown access to the server via firewalls. My guess is that you have it in the DMZ of your network, where you can turn off access by closing port 80/443.
2) Remove the DNS record from your Domain Controller or what ever device is in charge of the DNS for your sharepoint server. Then you can use the server's IP address to directly access SharePoint.
3) Close Port 80 on the server's firewall (see Server Baba's answer). Ensure that you followed the same steps:
If this is helpful please accept answer.