Re: published mail server behind 2006 cannot telnet out on port 25?

On Sat, 19 May 2007 14:23:02 +0600, Nick Domukhovsky <ndomukhovsky@xxxxx> wrote:

No anti-virus software is running.

As I mentioned, I tried creating an outbound access rule (port 25 of internal
computer's ip to External) - although, that wasn't mentioned (or I overlooked
it) in Shinder's book on ISA 2004.

I would think that I'd see a 'denied' connection in the monitoring - with a
explanation of which rule failed.

I'm obviously overlooking something trivial and obvious.

Thanks, Les Caudle

On Fri, 18 May 2007 11:03:51 -0700, "Asher_N" <ashernat@xxxxxxxxx> wrote:

Les Caudle <DotNetWannabe@xxxxxxxxxxxxxxxx> wrote in
news:3lor43deno3vm5f3fpg19c1a3jpb9vvp76@xxxxxxx:

I published an Exchange 2003 mail server behind an ISA 2006 firewall.

From the outside, POP3 works, and SMTP can be used to send an email to
an internal address.

But, the Exchange Server cannot send emails to the outside world, they
just stack up in the queue.

I notice that I cannot telnet to port 25 of an external SMTP server
from the Exchange Server.

I tried adding an outbound SMTP filter from the Exchange computer's ip
to External, but this had no effect.

I don't see anything denied in ISA's monitoring. I see the SMTP
Initiated Connection, and SMTP close connection. Nothing is denied.

I'm running the Exchange box as just a NAT client. Firwall client is
not installed.

What am I missing?

BTW - one other strange anomaly. I can ping www.news.com from the
Exchange box, and the 1st ping will generally go thru, but the next 3
(in the ping request) always fail. I can ping from the ISA box
without problem. --
Thanks in advance, Les Caudle

Is there an access rule for SMTP outbound in the ISA server?

Is there anti-virus running on the Exchange server? make sure that the
mass mailing protection is off, it blocks outbound port 25.

--
Thanks in advance, Les Caudle

1. Are you have one ISA or NLB cluster?
2. What error shows your pings (request timed out or some other error)?

Nick - there is only one ISA.

The 3 out of 4 PING responses that fail just say 'timed out'.

Thanks, Les Caudle
--
Thanks in advance, Les Caudle
.

Relevant Pages

  • Re: published mail server behind 2006 cannot telnet out on port 25?
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  • Re: published mail server behind 2006 cannot telnet out on port 25?
    ... From the outside, POP3 works, and SMTP can be used to send an email to ... But, the Exchange Server cannot send emails to the outside world, they ... Exchange box, and the 1st ping will generally go thru, but the next 3 ... Is there an access rule for SMTP outbound in the ISA server? ...
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