Nagios Support Forum

Hi Nagios Support,

Over the last few days, we have been experiencing issues with sending out emails via Nagios XI.
All alerts as seemed not able to send out notifications. Error message received is as follows :

SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/ ... leshooting (method=smtp;host=192.168.131.171;port=25;smtpauth=true;security=none), Referer: admin/testemail.php

Anything we should look at ? Please advise. Thanks a lot.




Regards,
Louis

Hi Louis,

It looks like it's having trouble connecting to the SMTP server. We have a guide on how to turn on debug mode for phpmailer to help troubleshoot this.

Before we go ahead an enable that, let's make sure the settings are correct. I've seen a few cases where the input fields (saved by the browser) are not current, please double check your settings, and then follow the guide below to enable debugging.

PHPMailer - Troubleshooting Using Debug Logging

Next, try to send a test email and post a screenshot of the error to the thread. Thanks.

Hi Ben,

Thanks for your prompt reply.
I managed to turn on the phpmailer debug logging. From the test result, it seems a test email
was send out successfully but I was unable to receive anything at my end. What could this be due
to ?

Please revert. Thanks. Attached are the screenshots.




Regards,
Louis

2020-06-09 03:04:07 Connection: opening to 192.168.131.171:25, timeout=300, options=array ()
2020-06-09 03:04:07 Connection: opened
2020-06-09 03:04:07 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "220 abft1smtsvr01.ABTNP.int Microsoft ESMTP MAIL Service, Version: 10.0.14393.0 ready at Tue, 9 Jun 2020 11:04:07 +0800 "
2020-06-09 03:04:07 SERVER -> CLIENT: 220 abft1smtsvr01.ABTNP.int Microsoft ESMTP MAIL Service, Version: 10.0.14393.0 ready at Tue, 9 Jun 2020 11:04:07 +0800
2020-06-09 03:04:07 CLIENT -> SERVER: EHLO 192.168.131.137
2020-06-09 03:04:07 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-TURN"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-SIZE 33554432"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-ETRN"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-PIPELINING"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-DSN"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-ENHANCEDSTATUSCODES"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-8bitmime"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES250-8bitmime"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-BINARYMIME"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES250-8bitmime250-BINARYMIME"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-CHUNKING"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES250-8bitmime250-BINARYMIME250-CHUNKING"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250-VRFY"
2020-06-09 03:04:07 SMTP -> get_lines(): $data is "250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES250-8bitmime250-BINARYMIME250-CHUNKING250-VRFY"
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250 OK"
2020-06-09 03:04:07 SERVER -> CLIENT: 250-abft1smtsvr01.ABTNP.int Hello [192.168.131.137]250-TURN250-SIZE 33554432250-ETRN250-PIPELINING250-DSN250-ENHANCEDSTATUSCODES250-8bitmime250-BINARYMIME250-CHUNKING250-VRFY250 OK
2020-06-09 03:04:07 CLIENT -> SERVER: MAIL FROM:<[email protected]>
2020-06-09 03:04:07 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250 2.1.0 [email protected] OK"
2020-06-09 03:04:07 SERVER -> CLIENT: 250 2.1.0 [email protected] OK
2020-06-09 03:04:07 CLIENT -> SERVER: RCPT TO:<[email protected]>
2020-06-09 03:04:07 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "250 2.1.5 [email protected] "
2020-06-09 03:04:07 SERVER -> CLIENT: 250 2.1.5 [email protected]
2020-06-09 03:04:07 CLIENT -> SERVER: DATA
2020-06-09 03:04:07 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:07 SMTP -> get_lines(): $str is "354 Start mail input; end with <CRLF>.<CRLF>"
2020-06-09 03:04:07 SERVER -> CLIENT: 354 Start mail input; end with <CRLF>.<CRLF>
2020-06-09 03:04:07 CLIENT -> SERVER: Date: Tue, 9 Jun 2020 11:04:07 +0800
2020-06-09 03:04:07 CLIENT -> SERVER: To: [email protected]
2020-06-09 03:04:07 CLIENT -> SERVER: From: [email protected]
2020-06-09 03:04:07 CLIENT -> SERVER: Reply-To: [email protected]
2020-06-09 03:04:07 CLIENT -> SERVER: Subject: Nagios XI Email Test
2020-06-09 03:04:07 CLIENT -> SERVER: Message-ID: <[email protected]>
2020-06-09 03:04:07 CLIENT -> SERVER: X-Mailer: PHPMailer 5.2.26 (https://github.com/PHPMailer/PHPMailer)
2020-06-09 03:04:07 CLIENT -> SERVER: MIME-Version: 1.0
2020-06-09 03:04:07 CLIENT -> SERVER: Content-Type: multipart/alternative;
2020-06-09 03:04:07 CLIENT -> SERVER: boundary="b1_e82ac1932409593e6c63dd243337bfc1"
2020-06-09 03:04:07 CLIENT -> SERVER: Content-Transfer-Encoding: 8bit
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: This is a multi-part message in MIME format.
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: --b1_e82ac1932409593e6c63dd243337bfc1
2020-06-09 03:04:07 CLIENT -> SERVER: Content-Type: text/plain; charset=us-ascii
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: This is a test email from Nagios XI
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: --b1_e82ac1932409593e6c63dd243337bfc1
2020-06-09 03:04:07 CLIENT -> SERVER: Content-Type: text/html; charset=us-ascii
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: This is a test email from Nagios XI
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: --b1_e82ac1932409593e6c63dd243337bfc1--
2020-06-09 03:04:07 CLIENT -> SERVER:
2020-06-09 03:04:07 CLIENT -> SERVER: .
2020-06-09 03:04:08 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:08 SMTP -> get_lines(): $str is "250 2.6.0 <[email protected]> Queued mail for delivery"
2020-06-09 03:04:08 SERVER -> CLIENT: 250 2.6.0 <[email protected]> Queued mail for delivery
2020-06-09 03:04:08 CLIENT -> SERVER: QUIT
2020-06-09 03:04:08 SMTP -> get_lines(): $data is ""
2020-06-09 03:04:08 SMTP -> get_lines(): $str is "221 2.0.0 abft1smtsvr01.ABTNP.int Service closing transmission channel"
2020-06-09 03:04:08 SERVER -> CLIENT: 221 2.0.0 abft1smtsvr01.ABTNP.int Service closing transmission channel
2020-06-09 03:04:08 Connection: closed

Hi Louis,

Interesting. Have you checked the spam folder on the test email account? In the initial error message, it was unable to connect, but now it is connecting and sending successfully but you did not receive the message. In this instance, it is typically the case that the message is being blocked or filtered.

Thanks Ben for shedding some light.
Managed to resolve the issue. Problem due to the mail routing has been disabled at the
Exchange Server accidentally by mail admin. What a relief !



Regards,
Louis

louissiong wrote:Thanks Ben for shedding some light.
Managed to resolve the issue. Problem due to the mail routing has been disabled at the
Exchange Server accidentally by mail admin. What a relief !



Regards,
Louis

Glad it is resolved!

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