netcat
A quick test to check if a firewall port is open between two servers.
On server #1:
$ nc -l <listen_port_here>On server #2 check if netcat can reach the target_server:
$ nc <target_ip> <target_port_here>Written by Lars Van Casteren
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A network firewall allows or blocks connections. It cannot tell a legitimate payment script from one that was swapped to copy card data in the browser.
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