[K12OSN] No reaction following lts.conf changes | I understand nothing

[Radek Bursztynowski]

Hello,

I made small step with my troubles, but I understand nothing.
As I mentioned one day ago, I installed successfully epel-6-i386 client and I can use them.
epel-6-i386:
/vat/lib/tftpboot/ltsp/i386 with /vat/lib/tftpboot/ltsp/i386/lts.conf file
/opt/ltsp/i386

I added old Scientific Linux 6.1 client image:
Scientific Linux 6.1
/var/lib/tftpboot/ltsp/5.2.i386 with /var/lib/tftpboot/ltsp/5.2.i386/lts.conf file
/opt/ltsp/5.2.i386/i386

Both of client images have own lts.conf but two of them load /usr/lib/tftpboot/i386/lts.conf file only. 
It means that I see two client behaviours as I arranged them in /usr/lib/tftpboot/i386/lts.conf file.
Scientific Linux 6.1 client doesn't load /var/lib/tftpboot/ltsp/5.2.i386/lts/conf file. Why?

I added Fedora 11 client image:
/var/lib/tftpboot/ltsp/5.2.i386-fed11 with /var/lib/tftpboot/ltsp/5.2.i386-fed11/lts.conf file
/opt/ltsp/5.2.i386-fed11

but this client doesn't load any lts.conf file. It uses default parameters (login window is accessible with Ctrl+Alt+F7 keys only and nothing more).

I don't understand...

Proper part for two of thin clients configuration dhcpd.conf file is:

# Thin Client HP 5520
  host thinclient {  
    option host-name "thinclient";
    hardware ethernet   00:16:35:7E:4F:D0;
    next-server 192.168.1.229;          
    filename  "/ltsp/5.2.i386-fed11/i386/pxelinux.0";                                            
    option root-path "192.168.1.229:/opt/ltsp/5.2.i386-fed11/i386";                              
  }

# Thin Client Pentium 4
  host pentium4-01 {                               
    option host-name "pentium4-01";                
    hardware ethernet   6C:F0:49:14:20:B8;         
    fixed-address 192.168.1.12;                    
    next-server 192.168.1.229;
    filename  "/ltsp/5.2.i386/i386/pxelinux.0";
    option root-path "192.168.1.229:/opt/ltsp/5.2.i386/i386";
  }

If my thin client uses Scientific Linux or Fedora 11 image I can't login to the server.
Because I got thin client images from another computer i executed ltsp-update-sskeys -u and I can see new certificates chroot/etc/ssh, but with no result.
I can log in to rprl-6-i386 client only.
How to change it?

Best regards,
Radek