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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