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Publish SMTP server : bug ?

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Publish SMTP server : bug ? - 5.Feb.2003 4:04:00 PM   
fesnouf@hotmail.com

 

Posts: 64
Joined: 14.Jan.2002
From: Paris
Status: offline
Hi,

I try to publish my internal SMTP server.

My ISA server has a nic on the internet and another one on my LAN.

I added a 'Server Publishing rule' on ISA such as :
* Action :
* Internal server : 192.168.1.1
* External IP of isa : 10.1.1.1
* Mapped server protocol : SMTP Server
There is also a 'Protocol Rule'
* Action : allow
* Protocol : SMTP
* Schedule Always
* Appky to any request

Port 25 is now opened on ISA external nic. When I 'Telnet' it I get the
connection, but then nothing. Helo does not work.

If I do the same thing on my internal SMTP server it works fine.

I also used some 'command line' SMTP tools and get the same problem (does
not work on ISA external nic, works on SMTP server).

Do you have an idea of what is going on ?

I have just done a netmon trace.
When my ISA talks to my SMTP server, the source IP adress is its 'external IP Address' (it sould be the lan one !) and destination is the 'internal Ip address'. The problem (I think) is that my SMTP servers does not know the 'external IP Address' (of course).

It is very strange ? What do you think ? a bug ?

Thanks
Post #: 1
RE: Publish SMTP server : bug ? - 5.Feb.2003 5:52:00 PM   
fesnouf@hotmail.com

 

Posts: 64
Joined: 14.Jan.2002
From: Paris
Status: offline
If I set ISA the default GW, it works fine. But if I look in the frames, the source IP address is still the external nic of ISA, which is not good at all.

So it works, but it hides the malfunction.

A bug somewere ?

Thanks for your feedback.

FrTdTric

(in reply to fesnouf@hotmail.com)
Post #: 2
RE: Publish SMTP server : bug ? - 5.Feb.2003 10:08:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi FrTdTric,

there is nothing wrong with ISA server! [Big Grin]

If you server publish an internal resource, that resource should be configured as a SecureNAT client. That means that his default gateway should point to the ISA internal interface.

By default, ISA don't translate the source IP address for inbound traffic in server publishing, because ISA is not really terminating the connection as is the case with web publishing (reverse proxy). However, you can change that behaviour if you like. Check out http://support.microsoft.com/default.aspx?scid=kb;en-us;311777 for more info.

HTH,
Stefaan

(in reply to fesnouf@hotmail.com)
Post #: 3
RE: Publish SMTP server : bug ? - 6.Feb.2003 9:40:00 AM   
fesnouf@hotmail.com

 

Posts: 64
Joined: 14.Jan.2002
From: Paris
Status: offline
Thanks for the info.

I have just set the registry key. Somethink changed but not as expected.

On my lan card I have 3 IPs : 192.168.1.1, 192.168.2.1 and 192.168.3.1. Mask is 255.255.255.0

The first one is 1.1 and I publish 192.168.1.10.

When I trace, I can see that the source address of the SMTP frame is 192.168.2.1.

It is strange because :
* This is not the first nic
* It is not the IP corresponding to the remote server.

Is this registry key designed for only 1 nic ?

Thanks for your feedback

FrTdTric

(in reply to fesnouf@hotmail.com)
Post #: 4
RE: Publish SMTP server : bug ? - 8.Feb.2003 3:34:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi FrTdTric,

why do you have three IP's on your internal interface in the first place? And why are they from a different networkID?

If you have an internal network with multiple networkID's, check out http://www.isaserver.org/tutorials/Designing_An_ISA_Server_Solution_on_a_Complex_Network.html how to configure ISA for that.

HTH,
Stefaan

(in reply to fesnouf@hotmail.com)
Post #: 5
RE: Publish SMTP server : bug ? - 8.Feb.2003 6:58:00 PM   
tshinder

 

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

LOL! I asked the same question over on the MS newsgroups [Big Grin]

Tom

(in reply to fesnouf@hotmail.com)
Post #: 6
RE: Publish SMTP server : bug ? - 8.Feb.2003 7:50:00 PM   
spouseele

 

Posts: 12830
Joined: 1.Jun.2001
From: Belgium
Status: offline
Hi Tom,

... and did you get a reasonable answer? [Big Grin]

Cheers,
Stefaan

[ February 08, 2003, 07:51 PM: Message edited by: spouseele ]

(in reply to fesnouf@hotmail.com)
Post #: 7
RE: Publish SMTP server : bug ? - 8.Feb.2003 8:29:00 PM   
tshinder

 

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

Not yet, still waiting [Razz]

Tom

(in reply to fesnouf@hotmail.com)
Post #: 8

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