You could try installing a program called Little Snitch. It's a program which monitors outgoing network traffic and you can allow or deny connections as you need. I think it might help stop your computer accessing other servers.
Thanks Jon, I'll give that a go.
@BeauNidle started
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You could try installing a program called Little Snitch. It's a program which monitors outgoing network traffic and you can allow or deny connections as you need. I think it might help stop your computer accessing other servers.