You can run a network sniffer(such as NAI Sniffer, CommView, EtherPeek, LanExplorer etc.) to get the server IP/Name/Port/Protocol, then block it.
If you don't want to install a sniffer, the firewall will pop up to ask you whether to block it if the target want to phone home.
Use ZoneAlarm Pro, Sygate Personal Firewall, Tiny Personal Firewall etc.
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AKA Solomon/blowfish.
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