freenx / qtnx

on the server:

Follow these instructions: FreeNX
• To see if nxserver processes were started after starting a client
watch 'ps aux |grep nx'

• To kill all server nx sessions (they will be restarted automatically at the next connection)
sudo nxserver --help
sudo nxserver --history
sudo nxserver --terminate username

• Other things:
sudo su - nx

• keys problems
  when setting up a new server machine. The following worked for me in the case where you have "Authenticating client" forever on your qtnx client
  root@aaa:/var/log# /usr/lib/nx/nxsetup --install --clean --purge

on the client:

install QTNX

If the graphical Qtnx GUI client does not show up, kill all qtnx process running on the client machine and run the qtnx client again

Make sure you set "gnome" (if you use gnome) and "adsl" in the QTNX config
.