PXE - Image to a BM Server

Hello,

I try to Image a workstation with PXE Preboot Services. Rather it
works, but only if I want to put the Image-file on the ZEN-Server.

Now I want to put the Image-file on another Server with BorderManager
installed. I'd tried to unload ipflt but this didn't change the
problem, it also says "cannot connect to image Server".

Is there any chance for me to set an DNS - Server for the PXE-
workstation?
Or is there anything else what I could do?

Thanks for any help/idea.

Michael