Having problems with outgoing mail utilizing alternate port smtp with no-ip.com
Posted on 2006-05-29
I am running a test lab in my home. I have an ISA server 2004 running as a edge firewall with three network adapters. one on 192.168.0.0, one on 192.168.1.0 and one with a static public IP address (external). In the 192.168.1.0 network i am running a windows 2003 ADI domain network with an exchange server loaded on a box which is also a DC. My ISP (Bellsouth) blocks SMTP port 25 for incoming and outgoing mail. I have setup my exchange to utilize a mail reflector from NO-IP.com and alternate SMTP port. I have established a mail server publishing rule on the isa box which redirects my incoming smtp traffic from NO-IP.com correctly and I have also configured the appropriate access rules to allow the smtp outgoing traffic thru my ISA box.
I can recieve incoming traffic and send / receive traffic internally without a problem. My issues are when sending traffic externally. When i had my exchange server setup just using the default smtp connector, the messages would just be stuck in the queue and i would see the note (specifiy an auth failure). I since setup an SMTP connector and now am receiving a (connection was dropped by the romote host). What is really confusing is that if i access my exchange server via OWA mail i can send without a problem. I have reviewed my isa logs and as far as i can tell ISA is allowing the outgoing connection.
thanks in advance for the help.