RDP 2.20 + BL25p (FW CD 7.40)

[NXS]

I have installed from the userguide RDP on a DL380 (Win2003SP1 + DHCP) who is connected to a GbE2 (FW2.20) switch. But whe I boot my first BL25p he gest the DHCP request and start loading his win98 SE DOS files. When he start the network (?unidriver?) he get a permission denied on the F share. When he loads the bootworker.exe. But I can see a connection on the share and files in read mode from the windows manager. I did some testing and it seems the network is very slow. I tryed different netword drivers and switch settings, but nothing works. Someone an idea??