user’s web site

i have a win2k server, as a domain controller, and a mix of 98,win2k pro workstations. i also have my website out there in the world at concentric. on the local lan, my win98 machines can get to my web site easily, but my win 2k pro workstations cannot. my local lan domain name is the same as my www.name. any ckues as to why my 2k pro ws’ cant get to my site?