Selecting authorized DHCP servers - still legacy IPs in list

Hi all,

First post in this group, so i'm hoping you can help me.

I usually like to manage more than one DHCP server at a time from one
server. So in the DHCP administration application I right click on DHCP at
the top of the tree, and select Add Server. Here I would like to click on
'This authorized DHCP server', and choose a server from the list, however for
the servers whose IP addresses have changed, their old addresses still appear
alongside them. There are also many legacy servers in the list. How do i
purge this list and ensure that the IP addresses are current? I have rebooted
all our domain controllers due to a server IP address change, and made sure
that DNS and WINS connectivity is correct.

If anyone can shed any light on why this would be happening I would
appreciate it.

Thanks

Andoni