The NoMachine configuration option for controlling the firewalling of its configured servers is EnableFirewallConfiguration. So how can you control NoMachine ports on Firewall?Īccording the NoMachine configuration file, usually, BaseDirectory/etc/server.cfg, the NoMachine server automatically configures the firewall for all of its configured services. Now, try to test the connection to NoMachine server port nc -vnz 192.168.57.26 4000 (UNKNOWN) 4000 (?) open Sample output showing the port connections is blocked by firewall (UNKNOWN) 22 (ssh) : Connection timed out Now, from one of the external systems, let us try to connect to SSH port to verify that UFW is running and blocking connections nc -vn 192.168.57.26 22 To confirm that UFW is running and blocking, we can try to test the connection to SSH port from a different server Ĭonfirm that the ssh service is running on a remote desktop system running NoMachine server netstat -altnp | grep 22 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 571/sshd: /usr/sbin In my test system, UFW is running and no port is opened on the firewall ufw status Status: active
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