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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?

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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.

This was first published in June 2003

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