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Block Connections to Insecure Services Running on Unprivileged Ports
SOCKS - TCP port 1080
NFS - UDP and TCP port 2049
X Windows - TCP ports 6000-6063
portmap - UDP and TCP port 111
Connections from clients bound to these ports should be allowed.
Connections to servers on these ports should be blocked - i.e. packets with one of these as the destination port, the SYN flag set, and the ACK flag cleared.