[Xymon] Xymon - smtp

Wed Mar 28 09:11:09 CEST 2018

Good news. Thanks for the feedback.

On Wed., 28 Mar. 2018, 6:07 pm Ajay Kumar Talla, <atalla at zetaglobal.com>
wrote:

> 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> 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>
> *Sent:* Wednesday, March 28, 2018 1:42 AM
> *To:* Root, Paul T <Paul.Root at CenturyLink.com>; Ajay Kumar Talla <
> atalla at zetaglobal.com>; 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 <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
> *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 <xymon-bounces at xymon.com>] *On
> Behalf Of *Ajay Kumar Talla
> *Sent:* Tuesday, March 27, 2018 12:59 PM
> *To:* 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)
>
>
>
>
>
> Could you please, let me know the solution for this.
>
>
>
> Thanks,
>
> Ajay
>
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>
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