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Let's set some pros/cons from security prospective for each and see: UDP (+) Relatively difficult to scan UDP open ports, and no stealthy scan exists (half connection in TCP by sending SYN). (-) Network devices (e.g. stateful firewalls, NAT) struggle to control UDP connections, as there are no FLAGS to rely on. (-) Reflected attacks are more common due to ...


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**Theoretically speaking just having an open port is not bad. It actually depends on the vulnerability of the application listening to this port. ** That being said, having more ports open, increases the probability of your system being discovered, and the chances of being exploited increases with the increase in the number of vulnerable applications ...


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... server and the client sends unencrypted TCP keepalive messages A TCP keepalive message is a packet with no payload, i.e. the length of the application data is 0. The objective of TLS is to protect the application data against sniffing and modification. Since there are no application data in the TCP keep alive message in the first place there is nothing ...


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