proxydhcp not working...

Simple LAN. ZCM 11 primary (appliance) providing imaging services. I
used to have proxydhcp running on my Netware dhcp server. That worked
great. I have now retired the Netware server and setup dhcp on an OES
11 server. I have enabled proxydhcp on my ZCM 11 server. The
configuration looks correct and I can't find any errors, but none of
my devices get a response from the proxydhcp server. When I boot
devices, they try to get a response but never do and just timeout. The
proxy DHCP daemon is running on my ZCM server. What might I be
missing? I'm stumped.