swiftmailer and Yii2 not working 1 out of 10 time - php

Question

I have a background process sending email to me when specific event occur.
It's working most of the time (9 out of 10), but sometime I get the following error message :
PHP Warning 'yii\base\ErrorException' with message 'fwrite(): SSL: An established connection was aborted by the software in your host machine.'
in E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php:232
Stack trace:
#0 [internal function]: yii\base\ErrorHandler->handleError(2, 'fwrite(): SSL: ...', 'E:\ProgramData\...', 232, Array)
#1 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php(232): fwrite(Resource id #481, 'MAIL FROM:<MTE#...')
#2 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\ByteStream\AbstractFilterableInputStream.php(171): Swift_Transport_StreamBuffer->_commit('MAIL FROM:<MTE#...')
#3 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\ByteStream\AbstractFilterableInputStream.php(90): Swift_ByteStream_AbstractFilterableInputStream->_doWrite('MAIL FROM:<MTE#...')
#4 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php(276): Swift_ByteStream_AbstractFilterableInputStream->write('MAIL FROM:<MTE#...')
#5 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\EsmtpTransport.php(243): Swift_Transport_AbstractSmtpTransport->executeCommand('MAIL FROM:<MTE#...', Array, Array)
#6 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\EsmtpTransport.php(322): Swift_Transport_EsmtpTransport->executeCommand('MAIL FROM:<MTE#...', Array)
#7 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php(416): Swift_Transport_EsmtpTransport->_doMailFromCommand('MTE#...')
#8 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php(444): Swift_Transport_AbstractSmtpTransport->_doMailTransaction(Object(Swift_Message), 'MTE#...', Array, Array)
#9 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\AbstractSmtpTransport.php(176): Swift_Transport_AbstractSmtpTransport->_sendTo(Object(Swift_Message), 'MTE#...', Array, Array)
#10 E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Mailer.php(85): Swift_Transport_AbstractSmtpTransport->send(Object(Swift_Message), Array)
#11 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2-swiftmailer\Mailer.php(146): Swift_Mailer->send(Object(Swift_Message))
#12 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\mail\BaseMailer.php(260): yii\swiftmailer\Mailer->sendMessage(Object(yii\swiftmailer\Message))
#13 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\mail\BaseMessage.php(48): yii\mail\BaseMailer->send(Object(yii\swiftmailer\Message))
#14 E:\ProgramData\htdocs\Yii2_KB\controllers\BackgroundTask.php(172): yii\mail\BaseMessage->send()
#15 E:\ProgramData\htdocs\Yii2_KB\vendor\bazilio\yii2-async\commands\AsyncWorkerCommand.php(29): app\controllers\BackgroundTask->execute()
#16 [internal function]: bazilio\async\commands\AsyncWorkerCommand->actionDaemon('background')
#17 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\base\InlineAction.php(55): call_user_func_array(Array, Array)
#18 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\base\Controller.php(151): yii\base\InlineAction->runWithParams(Array)
#19 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\console\Controller.php(91): yii\base\Controller->runAction('daemon', Array)
#20 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\base\Module.php(455): yii\console\Controller->runAction('daemon', Array)
#21 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\console\Application.php(167): yii\base\Module->runAction('async-worker/da...', Array)
#22 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\console\Application.php(143): yii\console\Application->runAction('async-worker/da...', Array)
#23 E:\ProgramData\htdocs\Yii2_KB\vendor\yiisoft\yii2\base\Application.php(375): yii\console\Application->handleRequest(Object(yii\console\Request))
#24 E:\ProgramData\htdocs\Yii2_KB\yii(23): yii\base\Application->run()
#25 {main}
PHP Warning: fwrite(): SSL operation failed with code 1. OpenSSL Error messages:
error:1409F07F:SSL routines:SSL3_WRITE_PENDING:bad write retry in E:\ProgramData\htdocs\Yii2_KB\vendor\swiftmailer\swiftmailer\lib\classes\Swift\Transport\StreamBuffer.php on line 232
Here follow my configuration for the mailer :
'mailer' => [
'class' => 'yii\swiftmailer\Mailer',
'transport' => [
'class' => 'Swift_SmtpTransport',
'host' => 'x.x.x.xxx',
'username' => 'xxx',
'password' => 'XyXyXy',
'port' => '25',
'encryption' => 'tls',
],
],
I'm using Yii 2.0.6
PHP Version : 5.5.9
Mail server : Exchange Server 2010
When it fail, it's mostly after a period of inactivity between 2 events ( a few hours).
Any ideas ?

Answer 1

Thanks to ineersa for the tips.
I've added the following code in the beginning of the background process, and now it's working.
if (Yii::$app->mailer->getTransport()->isStarted()) {
Yii::$app->mailer->getTransport()->stop();
}
Yii::$app->mailer->getTransport()->start();