Ubuntu – MAAS not working

I'm trying a whole week to make MASS to work, but no results.

This is the procedure:

maas createsuperuser
sudo apt-get install maas-dhcp
maas-import-isos
apt-get install maas-enlist tftpd-hpa
maas-import-isos

After this I start node machine with PXE as default first boot device, and select option maas-enlist.
Sistem start to installing some things, and after that on MAAS WebUI stand 1 node. But when I click on Node button on WebUI or refresh page, it show 0 node.

Command cobbler system list showing:

root@maas-serv:~# cobbler system list
   default
   node-3ee116ea-a8b2-11e1-a735-50e549e38206

Also, sometime this procedure register one node, but when registering second one, same problem like I described up.

root@maas-serv:/var/lib/tftpboot/pxelinux.cfg# is empty, only default is there.

On command maas-import-isos there is a one warning.
ftpboot/images/precise-x86_64-maas-ephemeral/initrd
copying images
generating GPXE/PXE configuration files
generating PXE menu structure
warning: kernel option length exceeds 255
warning: kernel option length exceeds 255
warning: kernel option length exceeds 255
warning: kernel option length exceeds 255
copying files for distro: precise-x86_64