PXE doesn't work on Windows 2008

Hi,

I've put in place the provisionning on some servers Windows 2003, PXE is on DHCP server for 2 and for the last one PXEis on another server than the DHCP.

All is working fine on thses 3 sites.

I tried to do the same on servers 2008 R2 X64 (on 3 sites, differents servers models) and it doesn't work.

For all of them PXE is on the DHCP server.

It seems that when i boot in PXE i don't receive ip from DHCP server.

My landesk version is 9 SP3

I try with PXE server on my laptop, it worked when i made the try on 2003 servers, but not on 2008.

Is someone had the same problem.

Regards.