ACE SMTP probe not working

Unanswered Question
Jul 21st, 2008
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I configured a basic SMTP probe but it is not working properly : all the rservers are failing and the 'show probe detail' command shows the configured probe receives an invalid status code.

Here is a portion of the configuration :


probe smtp PROBE_SMTP

interval 20

expect status 211 221

rserver host SMTPIN1

ip address



rserver host SMTPIN2

ip address




And here is the telnet on port25 output to 2 rservers (failing one and operational one)

telnet 25


Connected to

Escape character is '^]'.

421 4.3.2 Service not available, closing transmission channel

Connection closed by foreign host.

telnet 25


Connected to

Escape character is '^]'.

220 XXXXXXXXXXXXX Microsoft ESMTP MAIL Service ready at Fri, 18 Jul 2008 09:41:08 +0200

Any idea what is going wrong ?

Thank you in advance.

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Overall Rating: 5 (2 ratings)
Syed Iftekhar Ahmed Mon, 07/21/2008 - 01:06
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What ACE code are you running?

I face a similar issue where ACE probe was failing because of the way ACE sends its SMTP probe.

ACE sends a "helo smtp_probe" command to the mail server. Some mail servers (rfc 2821 compliant) do not like the underscore (details in rfc 2821).

You can ask your mail server people if ""helo smtp_probe" is acceptable by the Mail Servers.

Syed Iftekhar Ahmed

MMazuhelli_2 Mon, 07/21/2008 - 11:50
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This is documented as bugID CSCsm90293 and it's been fixed with release A2(1.1), at least according to the ACE 2(1.1) release notes. This version was released on June 10, 2008.



sboukef Tue, 07/22/2008 - 22:52
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I first tried to check helo probe_smtp :

telnet .... 25

220 xxxxxxx.enterprise Microsoft ESMTP MAIL Service

ready at Tue, 22 Jul 2008 10:44:39 +0200

helo probe_smtp

250 xxxxxxx.enterprise Hello []

So the underscore is accepted. Putting return status code to "250 250" did not solve the issue.

I will operate an upgrade and let you know

Syed Iftekhar Ahmed Tue, 07/22/2008 - 23:25
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Following is a smtp probe I am using at a working config

probe smtp npmail

interval 5

passdetect interval 5

passdetect count 2

receive 1

open 1

expect status 220 250

Could you post output of

sh probe PROBE_SMTP detail

with both the expect status codes.


Fernando Sacris... Thu, 11/24/2011 - 05:17
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Hi Syed,

I configured the probe you suggested and it works perfectly.




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