WDM 5.5 Cannot push image

I am trying to push some images out to some windows embedded thin clients.  I have updated the boot agent to the latest version.  When I try to push the image the client reboot and starts, on one screen is shows "No Ethernet device found".  It never gets past the dns-host name lookup method.  This used to work when we were on an older version.  I have dhcp, dns-host, and dns service setting setup.

This server has been upgraded many times from an old version.  Should I just try and build a new server?

Thanks

Nick