Can someone clarify the following section of the tutorial covering INtradomain ZComms through ISA? Does this mean the DMZ DC needs the reg changes or the DC on the internal network?? Configure the Registry Entries The DMZ host will need to use RPCs to communicate with the internal network DC. Because RPC is less than friendly to most Firewalls, we have to make some registry changes on the DC to allow the DMZ host to communicate with the internal network DC through the ISA Server. Thanks in advance!