my Wndows 2003 domain controller has stopped issuing DHCP addresses

I have a windows 2003 domain controller running the DHCP service.  we have the scope set to have the leases expire in 1 day.  Today, as the leases expire, the clients are not being renewed.  We have already re-booted the DHCP server and also checked the event logs.  No errors related to DHCP in the event logs.
Henrik1Asked:
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slemmesmiCommented:
Dear Henrik1,

a DHCP helper address in a network (layer3) is well described in http://en.wikipedia.org/wiki/UDP_Helper_Address
Do you have a network team that eventually can assist you in determining changes?

The reason why I ask, is if your DHCP server has a different IP address (either that has changed or the DHCP helper address has), then DHCP enabled clients/devices connecting to the network can no longer renew (or obtain a new) the IP address.

Kind regards,
Soren
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slemmesmiCommented:
Dear Henrik1,

did something change on your physical network, such as the DHCP helper address no longer available on network layer 3?

Kind regards,
Soren
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Henrik1Author Commented:
I'm not sure I understand the question.  I don't think anything changed on the network.  can you explain what a DHCP helper address is?
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Henrik1Author Commented:
Thanks for the comments and solution.  The DHCP helper was the problem as a Cisco router had been de-installed at our other site.  
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