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How can I block foreign servers from accessing IPC$ on my local server?

I noted on my network that foreign servers from another domain are being connecting to my local servers. The only resource used is IPC$. My first thought is that a virus is trying to establish the connection to propagate on my local network through open shares. How can I stop those servers from connecting?
If you are running Windows 2000 server, you can use IPsec to block connection attempts from the IP addresses of the servers that are attempting to connect to your IPC$ share. You should also ensure that the IPC$ share itself has the minimum necessary permissions assigned to it so that unauthorized users cannot access it.

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