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This should do it iptables -I OUTPUT -p tcp --tcp-flags ALL RST,ACK -j DROP RST/ACK is sent when nobody is listening to the port. But you want to keep RST for legitimate use. You could also use the state flags ESTABLISHED to make sure you allow for RST in that state. The chain could be FORWARD too, it depends on your setup.


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What am I doing wrong? … having expectations w/o studying how things work? Locally originating traffic won't follow the same way as external does. Instead of PREROUTING you'd need using OUTPUT.


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