..because they get new DNS server information from the connection they use outside of your network and those DNS servers can discover your DNS servers through the preexisting DNS structure that has served the Internet since it was ARPANet. That's what I was talking about with "create a proper DNS structure". If you want your Internet-enabled folks to reach your Exch server, then make it resolvable externally. If you want your internal folks to reach it, use the same technique internally. This is the basis behind the split-DNS idea. Two separate DNS servers offering two different "views" on the same DNS domain. Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! -----Original Message----- From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx] Sent: Tuesday, November 23, 2004 1:36 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: RPC over HTTPS (ISA & Outlook) http://www.ISAserver.org Hi Jim, And how do the people with their notebook access the Exchange server via RPC over HTTPS if their machines can't see the DNS server from their home or while they are on the road in the another country?? Andrew -----Original Message----- From: Jim Harrison [mailto:Jim@xxxxxxxxxxxx] Sent: Tuesday, November 23, 2004 3:19 PM To: [ISAserver.org Discussion List] Subject: [isalist] RE: RPC over HTTPS (ISA & Outlook) http://www.ISAserver.org Why are you mucking about in the hosts file at all? Don't do that; configure a proper DNS structure instead. Jim Harrison MCP(NT4, W2K), A+, Network+, PCG http://isaserver.org/Jim_Harrison/ http://isatools.org Read the help / books / articles! -----Original Message----- From: Andrew English [mailto:andrew@xxxxxxxxxxxxxxxxxxxxxx] Sent: Tuesday, November 23, 2004 11:59 AM To: [ISAserver.org Discussion List] Subject: [isalist] RPC over HTTPS (ISA & Outlook) http://www.ISAserver.org I still have not found the ISA 2004 (RPC over HTTPS) yet that Tom did, anyhow I do recall when I last saw it that it mentioned that you have to setup your client hosts file to point to the mail server via the Internet IP of the mail server. The million dollar question is what if the client is using his/her notebook in both their home and office environment. Does it mean that while at the office their Outlook will go through ISA out to the internet and turn around then go back through ISA to the mail server or do I have to turn something on in ISA so that it doesn't have to loop itself? Andrew All mail to and from this domain is GFI-scanned.