dhcp on wan nic on ISA 2000

I am receiving the underneath message in the eventviewer.
Things seems to keep working, but it bugging me.

info
the lan nic has a fix ip, the wan nic has dhcp configured.

I noticed if I install dhcp server on the server it wants to default to the wan nic. ??

Your computer was not able to renew its address from the network (from the DHCP Server) for the Network Card with network address 00105A857406. The following error occured:
The semaphore timeout period has expired. . Your computer will continue to try and obtain an address on its own from the network address (DHCP) server.

Leopold