Install Nomachine NX Server Free Edition on Debian Linux








The Nomachine nxserver free edition has limitation: allows only 2 concurrent user sessions. But it is fine for me to connect to my Linux workstation at work. It is easier to setup than the freenx server. See the guide below:
  1. Run the following commands to download and install nomachine nxclient, nxnode and nxserver packages:
    if [[ $(uname -m)=="x86_64" ]]; then export MARC=amd64; else export MARC=i386; fi
    wget http://web04.nomachine.com/download/3.5.0/Linux/nxclient_3.5.0-7_${MARC}.deb
    sudo dpkg -i nxclient_3.5.0-7_${MARC}.deb
    wget http://web04.nomachine.com/download/3.5.0/Linux/nxnode_3.5.0-9_${MARC}.deb
    sudo dpkg -i nxnode_3.5.0-9_${MARC}.deb
    wget http://web04.nomachine.com/download/3.5.0/Linux/FE/nxserver_3.5.0-11_${MARC}.deb
    sudo dpkg -i nxserver_3.5.0-11_${MARC}.deb
    
  2. Setup your own server private key instead of the nomachine key:
    sudo ssh-keygen -t dsa -f /usr/NX/home/nx/.ssh/id_dsa
    sudo chown nx:nx /usr/NX/home/nx/.ssh/id_dsa
    sudo mv /usr/NX/home/nx/.ssh/authorized_keys2 /usr/NX/home/nx/.ssh/authorized_keys2.old
    sudo cat /usr/NX/home/nx/.ssh/id_dsa.pub >> /usr/NX/home/nx/.ssh/authorized_keys2
    
    You can now use the private key in /usr/NX/home/nx/.ssh/id_dsa for your client to connect to the nxserver.
  3. Secure ssh for NX server by editting /etc/ssh/sshd_config as root:
    • Enable PubkeyAuthentication for all:
      PubkeyAuthentication yes
    • Disable PasswordAuthentication for all:
      PasswordAuthentication no
    • Allows PasswordAuthentication only for the FreeNX users by appending the following line to sshd_config:
      Match Group nxusers 
          PasswordAuthentication yes
      or if you want to allow individual users:
      Match User john alex
          PasswordAuthentication yes



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