DHCP problems? not using configured address 1.2.3.4 because it was previously declined

I am trying to troubleshoot a problem I am only having with rockstor on my network. I keep having problems with rockstor not being given the IP address it should get. The DHCP log shows:

Feb 2 16:40:36 fw dnsmasq-dhcp[1461]: not using configured address 1.2.3.4 because it was previously declined

If you are using DHCP with dnsmasq to assign an IP address to your rockstor box, could you check the logs on your DHCP server?

grep "because it was previously declined" /var/log/messages # on the DHCP server, not the rockbox!

Thanks!