asterisk users - Feb 2007 - F1000 web configure

I have 8 - F1000G utstar phones. on a couple of them I can configure 
them by the
WEB interface with no problem. On a couple of the them I cannot. I get 
no response
when I point the browser to them.

THe units work. keypad is fine. I can examine the network values - 
specifically the
DHCP address. etc... Just cant get the web interface to do anything.

Has anyone had this issue and know how to enable the WEB interface?

Thanks so much,

Jerry