I have 2 Macs running OSX on a W2K domain. I am using DNS. The problem that I'm having is that sometimes the Mac's can ping by name and sometimes they can't. It seems that they lose their ability to resolve names. I tried to modify the Hosts file, but it wouldn't let me even after changing the permissions. Also, in Outlook 2001 I tried to add the IP address of the Exchange Server instead of the name, but ti keeps reverting back.