Here’s a way to open the jetdirect port on linux, by adding a service wrapper under /etc/xinetd.d/ folder with the name jetdirect. Here is the content:
service jetdirect
{
socket_type = stream
protocol = tcp
wait = no
user = lp
server = /usr/bin/lp
server_args = -d printer1 -o raw
groups = yes
disable = no
}
Restart the xinetd service and run nmap to see if port 9100 has been opened.
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