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SMTP Traffic Problem
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SMTP Traffic Problem - 6.Jun.2007 1:19:08 PM
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BrandonOz
Posts: 23
Joined: 30.Jan.2007
Status: offline
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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?
Please help?
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RE: SMTP Traffic Problem - 6.Jun.2007 1:31:55 PM
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BrandonOz
Posts: 23
Joined: 30.Jan.2007
Status: offline
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I even set up a rule allowing all outbound traffic (for testing purposes) from the linux box (which is on the DMZ) to my ISA server and it still denies the SMTP traffic???
It does not show why its being blocked (ignore previous statement about default rule)
I don't understand why it blocks it on 1 ISA server but not another?
Please Help
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RE: SMTP Traffic Problem - 8.Jun.2007 8:29:30 AM
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tshinder
Posts: 47659
Joined: 10.Jan.2001
From: Texas
Status: offline
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Hi Brandon,
OK, it sounds like the linux box is actually in the default External Network. If so, then you can use an SMTP publishing rule to solve that problem.
HTH,
Tom
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Thomas W Shinder, M.D.
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Blog: http://blogs.isaserver.org/shinder/
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RE: SMTP Traffic Problem - 8.Jun.2007 9:42:26 AM
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BrandonOz
Posts: 23
Joined: 30.Jan.2007
Status: offline
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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 I’m 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. Didn’t 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 doesn’t 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.
B
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RE: SMTP Traffic Problem - 18.Jun.2007 10:39:40 AM
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BrandonOz
Posts: 23
Joined: 30.Jan.2007
Status: offline
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Any suggestions Tom?
I still have my crazy setup in place until I find a solution.
Thanks.
B
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but I have it set up as follows. 
When I go to the ISA server which is in front of the Exchange the isn’t 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???) 