[Xymon] Xymon - smtp

[Ajay Kumar Talla]

Thank you Jeremy and Paul for pointing me in the right direction.
As you explained it was due to DNS issue, fixed it by adding the IP’s to /etc/hosts file

Thanks for your help.


--Aj
From: Jeremy Laidman <jeremy at laidman.org>
Sent: Wednesday, March 28, 2018 11:30 AM
To: Ajay Kumar Talla <atalla at zetaglobal.com>
Cc: Root, Paul T <Paul.Root at centurylink.com>; xymon at xymon.com
Subject: Re: [Xymon] Xymon - smtp

The default timeout for xymonnet is 10 seconds. The xymonnet command in tasks.cfg can have "--timeout=N" added to adjust timeouts.

Have you tried to connect to the service yourself, using telnet, to see if there is indeed a timeout, and what form it takes? Something like this:

$ printf "mail\r\nquit\r\n" | time nc ipxdvo.tcif.telstra.com.au<https://na01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fipxdvo.tcif.telstra.com.au&data=02%7C01%7Catalla%40zetaglobal.com%7C877f1a9610fd49f3321508d594713896%7C47049324c4984be5acf70154448a1107%7C1%7C1%7C636578136371924356&sdata=kzvKE6%2B8JI73gpWryo0lfLr4N5AOOG%2B8OtSqc%2FZ2Jw4%3D&reserved=0>. 25

or if you don't have nc or netcat:

$ { printf "mail\r\nquit\r\n"; sleep 1; } | time telnet qts-pro-cm-weber 25

Xymon has more than one form of timeout. I believe if Xymon fails to connect due to a timeout, it will show a different error to what you've seen. In your case, I suspect Xymon has connected, and has issued its commands (mail and quit, from protocols.cfg), and is waiting for "220". If it doesn't get a 220 within 10 seconds, it will timeout the session.

I've seen this type of thing happen when TCP wrappers are used to limit access to a service, or for similar security measures. In these cases, the incoming connection is from a host that the mail server does not know about, and so it attempts to find the hostname by reverse DNS lookup. If DNS is slow or misconfigured on the mail server, the DNS lookup can take 15 seconds to fail. In these cases, a quick fix is to add the Xymon server IP address to the /etc/hosts file on the mail server. A better solution is to fix the DNS.

J


On 28 March 2018 at 07:27, Ajay Kumar Talla <atalla at zetaglobal.com<mailto:atalla at zetaglobal.com>> wrote:
Thank you for the information.
But I don’t see any huge CPU  load on my server for the past 4 hours. But still SMTP test is flapping.
The screenshot attached says “connection timedout” is there a way to change the time-out setting?

I have the same SMTP test on another server whose Load becomes high at times, but it’s SMTP remains green.

From: Root, Paul T <Paul.Root at CenturyLink.com<mailto:Paul.Root at CenturyLink.com>>
Sent: Wednesday, March 28, 2018 1:42 AM
To: Root, Paul T <Paul.Root at CenturyLink.com<mailto:Paul.Root at CenturyLink.com>>; Ajay Kumar Talla <atalla at zetaglobal.com<mailto:atalla at zetaglobal.com>>; xymon at xymon.com<mailto:xymon at xymon.com>
Subject: RE: Xymon - smtp


https://serverfault.com/questions/119026/question-on-sendmail-daemon-actions-when-load-average-is-too-high<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fserverfault.com%2Fquestions%2F119026%2Fquestion-on-sendmail-daemon-actions-when-load-average-is-too-high&data=02%7C01%7Catalla%40zetaglobal.com%7C5184c4e69cfc41d611ff08d5941f037d%7C47049324c4984be5acf70154448a1107%7C1%7C0%7C636577783282992025&sdata=gTT%2BrA7A88BosFDvteurJlcdKSi7XiT1ug6l%2FSd5zPg%3D&reserved=0>

From: Xymon [mailto:xymon-bounces at xymon.com] On Behalf Of Root, Paul T
Sent: Tuesday, March 27, 2018 3:10 PM
To: 'Ajay Kumar Talla'; xymon at xymon.com<mailto:xymon at xymon.com>
Subject: Re: [Xymon] Xymon - smtp

This is a load issue. Sendmail will refuse to process mail messages if the CPU is too busy.

From: Xymon [mailto:xymon-bounces at xymon.com] On Behalf Of Ajay Kumar Talla
Sent: Tuesday, March 27, 2018 12:59 PM
To: xymon at xymon.com<mailto:xymon at xymon.com>
Subject: [Xymon] Xymon - smtp

Hi,

I’m using smtp test in Xymon for monitoring. However sometimes, I’m getting error as connection timed out.  After sometime it is showing as Green(Flapping status)

[cid:image001.png at 01D3C691.82BB8000]

Could you please, let me know the solution for this.

Thanks,
Ajay
This communication is the property of CenturyLink and may contain confidential or privileged information. Unauthorized use of this communication is strictly prohibited and may be unlawful. If you have received this communication in error, please immediately notify the sender by reply e-mail and destroy all copies of the communication and any attachments.
This communication is the property of CenturyLink and may contain confidential or privileged information. Unauthorized use of this communication is strictly prohibited and may be unlawful. If you have received this communication in error, please immediately notify the sender by reply e-mail and destroy all copies of the communication and any attachments.

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