I'm at my wits end trying to figure out why I'm unsuccessful at publishing the secure w2k3 exchange server on ISA. It doesn't seem to matter if I'm using split DNS or the internal DNS, I continue to get an error stating there are no external IP addresses available. Port 25 is enabled for the server at the router just as ports 80 & 443 are for OWA. Would anyone happen to have any other suggestions on what I can trouble-shoot to resolve this?? tia