I am having problems with one of my servers sending SMTP traffic to my exchange behind the ISA firewall.
The server in question CAN send SMTP traffic to another one of my exchange servers behind another ISA firewall. (Different Network) and also GMAIL etc. The server in question is a Linux web box, and from looking at the logs on the firewall it seems its being denied by the default rule.
The firewall lets it initiate the SMTP, Then Closes the SMTP, Then Denies the SMTP?
This is going to sound bad but I have it set up as follows.
The Linux Web Server Box has a Public IP. It sits directly on the DMZ switch. The "A" record is pointed to my ISA se '06 server which then in turns re-directs it to the Linux Boxes Public IP (On the same DMZ switch) So when people go to the web site they first pass through my ISA server.
The Linux box needs to send SMTP mail from a certain site, its does successfully everywhere except to one particular domain, which happens to be the most important one When I go to the ISA server which is in front of the Exchange the isnít receiving the email, I notice under the log files the SMTP traffic is being denied from the Linux's Public IP, which is on the same DMZ switch. (So is another ISA server which accepts the SMTP traffic???)
I have no "rule" set up except that of a SMTP rule that allows from external, internal to external, internal.
Look forward to your response.
(And please please please release a 2006 ISA book ASAP )
I set up a SMTP rule but it still denies the connection. I have temporarily put in place the working model as follows.
Linux Web Box (Public I.P) sends SMTP protocol to > ISA1 server on same DMZ switch (Same subnet) ISA1 forwards SMTP to > Exchange 2007 distribution group. Distribution Group then forward SMTP Mail back to > Other ISA2 Server on same DMZ switch (Same subnet, completely different network) ISA2 server forwards SMTP mail to > Exchange 2003 server. Appropriate users then receive email. But obviously this is NOT what Iím after.
What I'm trying to do is just have the Linux Box send the SMTP mail to Server ISA2, which then in turns forwards to the Exchange 2003 server. But the ISA2 server denies the SMTP from the Linux Box.
I have set up a SMTP access rule. Didnít work even when using the specific IP's. I have set up a mail server publishing rule and this also was unsuccessful.
The Linux Box doesnít need to receive email, just send the SMTP protocol. Funny thing about this whole situation is that the Linux Box has no trouble sending it else where except this one ISA2 server...
I look forward to all the help I can get. And thank you for getting back to me.