• RSS
  • Twitter
  • FaceBook

Welcome to ISAserver.org

Forums | Register | Login | My Profile | Inbox | RSS RSS icon | My Subscription | My Forums | Address Book | Member List | Search | FAQ | Ticket List | Log Out

SMTP Traffic Problem

Users viewing this topic: none

Logged in as: Guest
  Printable Version
All Forums >> [ISA 2006 General] >> General >> SMTP Traffic Problem Page: [1]
Login
Message << Older Topic   Newer Topic >>
SMTP Traffic Problem - 6.Jun.2007 1:19:08 PM   
BrandonOz

 

Posts: 25
Joined: 30.Jan.2007
Status: offline
 

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?
Post #: 1
RE: SMTP Traffic Problem - 6.Jun.2007 1:31:55 PM   
BrandonOz

 

Posts: 25
Joined: 30.Jan.2007
Status: offline
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

(in reply to BrandonOz)
Post #: 2
RE: SMTP Traffic Problem - 7.Jun.2007 10:13:47 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Brandon,

What is the Network Rule configured as which connects the DMZ to the default Internal Network?

Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to BrandonOz)
Post #: 3
RE: SMTP Traffic Problem - 7.Jun.2007 12:02:30 PM   
BrandonOz

 

Posts: 25
Joined: 30.Jan.2007
Status: offline
 
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 )



(in reply to tshinder)
Post #: 4
RE: SMTP Traffic Problem - 8.Jun.2007 8:29:30 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
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

_____________________________

Thomas W Shinder, M.D.

(in reply to BrandonOz)
Post #: 5
RE: SMTP Traffic Problem - 8.Jun.2007 9:42:26 AM   
BrandonOz

 

Posts: 25
Joined: 30.Jan.2007
Status: offline
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.

B

(in reply to tshinder)
Post #: 6
RE: SMTP Traffic Problem - 9.Jun.2007 2:09:35 PM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
You have a picture of the setup? I'm getting really confused and this should be easy.

Thanks!
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to BrandonOz)
Post #: 7
RE: SMTP Traffic Problem - 18.Jun.2007 10:39:40 AM   
BrandonOz

 

Posts: 25
Joined: 30.Jan.2007
Status: offline
Any suggestions Tom?

I still have my crazy setup in place until I find a solution.

Thanks.

B

(in reply to BrandonOz)
Post #: 8
RE: SMTP Traffic Problem - 19.Jun.2007 10:02:14 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
Hi Brandon,

I was thinking more in terms of a network diagram.

Thanks!
Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to BrandonOz)
Post #: 9
RE: SMTP Traffic Problem - 19.Jun.2007 10:04:42 AM   
tshinder

 

Posts: 50013
Joined: 10.Jan.2001
From: Texas
Status: offline
I also need to see your Network Rules.

Tom

_____________________________

Thomas W Shinder, M.D.

(in reply to tshinder)
Post #: 10

Page:   [1] << Older Topic    Newer Topic >>
All Forums >> [ISA 2006 General] >> General >> SMTP Traffic Problem Page: [1]
Jump to:

New Messages No New Messages
Hot Topic w/ New Messages Hot Topic w/o New Messages
Locked w/ New Messages Locked w/o New Messages
 Post New Thread
 Reply to Message
 Post New Poll
 Submit Vote
 Delete My Own Post
 Delete My Own Thread
 Rate Posts