OK, I will try using the wizard to create a new connection.
1. echo $DISPLAY –> :0
2. echo $XAUTHORITY –> /home/fdelpin/.Xauthority
3. ls -l $HOME/.Xauthority –> ls: cannot access /home/fdelpin/.Xauthority: No such file or directory
4. LD_LIBRARY_PATH=/usr/NX/lib /usr/NX/bin/nxauth -f $XAUTHORITY list $DISPLAY –> lautaro/unix:0 MIT-MAGIC-COOKIE-1 a79c464f89a67d121ea57f310b5dc83a