I am using an external DNS server at the ISP. Named is not loaded.

I can ping the site by name from a XP workstation on the network but not
from the server console. At the server I can ping the ip address. I can
ping other sites by name just not the one I need. (mx 450 error on GWIA)
I plan to reboot the server tonight but was wondering if the DNS is
cached on the server and is corrupt? If DNS is cached or corrupt on the
server how can I force a refresh?