Combination Exchange/ISA issue. Help, please!!?! I'm stumped!!!

  • From: "Ian Sterling" <i_sterling@xxxxxxxxxxx>
  • To: exchangelist@xxxxxxxxxxxxx
  • Date: Tue, 22 Jan 2002 14:33:51 -0600

OK, I?m stumped. I am posting this to both the list and the list, so please excuse the cross-post, but I just haven?t been able to determine where my main problem is coming from. Any help/suggestions would be greatly appreciated.

I have Back Office Server 2000 on a multi-server setup. I have 3 servers ( & external = ISA; = SQL/PDC; = Exchange).
The PDC is also internal DNS (with a forwarder to our ISP?s DNS set-up), DHCP, and the main file server. All clients are running Outlook 2000 or XP. My problem comes with trying to send mail to a specific external domain (user@xxxxxxxxx). When sending mail to a contact in the domain, any user inside the network will receive an NDR and then a delay notification. The Exchange manager shows that the messages are in the queue, but they show (Remote Delivery). Eventually, a final NDR will be delivered to the sender of the e-mail, and the message times out. ( seems to be the only domain I have had this issue with.) {Of course, I?m not blocking I?m aware of, at least. The only things that are blocked using filters are message attachments (.exe, .ini, .scr, etc.) and known virus subject lines (I Love you, ?Hi?, etc).

I?m pretty sure that the internal servers are both working fine as Secure NAT clients, because I can fully access the internet from both servers using the standard allowed protocols. However, I have noticed that I cannot do a NSLOOKUP from either internal machine. The ISA server, of course, can do full NSLOOKUP without any problems. (I installed DNS on it to see if maybe that was an issue, and the results are the same from the internal servers.) is the only domain that I can?t send e-mail to, though, even with the NSLOOKUP issues.

Help!!!!! Can someone point me in the right direction here? I thought all rules & protocol definitions were set up correctly (I even have a client set defined for the internal servers, and I?ve checked the protocol definitions and rules to no avail.)

Thank you for your help,

Ian Sterling

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