XF 1.5 Automated Bounced Email Handler- server errors

[Sunka]

Every half hour I get this error. It is triggered by cron - Process Email Bounces

Server Error Log
Error Info
Zend_Mail_Protocol_Exception: cannot connect to host; error = (errno = 0 ) - library/Zend/Mail/Protocol/Imap.php:100
Generated By: Unknown Account, 1 minute ago
Stack Trace
#0 /home/nginx/domains/pijanitvor.com/public/library/Zend/Mail/Storage/Imap.php(273): Zend_Mail_Protocol_Imap->connect('ssl://imap.gmai...', 993, 'SSL')
#1 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/EmailBounce.php(292): Zend_Mail_Storage_Imap->__construct(Object(stdClass))
#2 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Deferred/EmailBounce.php(19): XenForo_Model_EmailBounce->openBounceHandlerConnection()
#3 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(295): XenForo_Deferred_EmailBounce->execute(Array, Array, 7.9999988079071, '')
#4 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 7.9999988079071, '', false)
#5 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, 8, '', false)
#6 /home/nginx/domains/pijanitvor.com/public/deferred.php(23): XenForo_Model_Deferred->run(false)
#7 {main}
Request State
array(3) {
  ["url"] => string(39) "https://www.pijanitvor.com/deferred.php"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(3) {
    ["_xfRequestUri"] => string(44) "/threads/luk-kozjak-allium-ascalonicum.5870/"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfResponseType"] => string(4) "json"
  }
}

Server Error Log
Error Info
Zend_Mail_Protocol_Exception: cannot connect to host; error = (errno = 0 ) - library/Zend/Mail/Protocol/Imap.php:100
Generated By: Unknown Account, A moment ago
Stack Trace
#0 /home/nginx/domains/pijanitvor.com/public/library/Zend/Mail/Storage/Imap.php(273): Zend_Mail_Protocol_Imap->connect('ssl://imap.gmai...', 993, 'SSL')
#1 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/EmailBounce.php(292): Zend_Mail_Storage_Imap->__construct(Object(stdClass))
#2 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Deferred/EmailBounce.php(19): XenForo_Model_EmailBounce->openBounceHandlerConnection()
#3 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(295): XenForo_Deferred_EmailBounce->execute(Array, Array, 7.9963009357452, '')
#4 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(429): XenForo_Model_Deferred->runDeferred(Array, 7.9963009357452, '', false)
#5 /home/nginx/domains/pijanitvor.com/public/library/XenForo/Model/Deferred.php(374): XenForo_Model_Deferred->_runInternal(Array, 8, '', false)
#6 /home/nginx/domains/pijanitvor.com/public/deferred.php(23): XenForo_Model_Deferred->run(false)
#7 {main}
Request State
array(3) {
  ["url"] => string(39) "https://www.pijanitvor.com/deferred.php"
  ["_GET"] => array(0) {
  }
  ["_POST"] => array(4) {
    ["_xfRequestUri"] => string(98) "/admin.php?cron/emailBounce/run&_xfToken=1%2C1476061415%2C4f2217797ad0b3cb636b5181e33697821e715d64"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfToken"] => string(8) "********"
    ["_xfResponseType"] => string(4) "json"
  }
}

Automated Bounced Email Handler working OK till 26.09.2016.
After that, every half hour I get this error.
Nothing was changed, just stop working.
gmail address for bounced e-mails is same, with same login data and options, amazon ses is same, xenforo acp e-mail settings did not changed...
Where else to look for source of problem?

This is my configuration in ACP

 

[Paul B]

If you have changed nothing, contact your host and ask them if they have made any changes on the server.

The fundamental issue is this:

cannot connect to host

Which is a server level issue (assuming the credentials are still valid).

 

[Sunka]

I managing server. Nothing is changed, and credentials are still valid.
Nothing changed on server, nor with credentials

 

[TPerry]

Odds are you are using dovecot.. make sure it's running and does not have an error preventing it from starting up.

 

[Sunka]

are you are using dovecot

Nop

 

[TPerry]

If you are running your own server, you should have some error logs you can review.
Only time I've seen that is if the imap server is not running or not listening on the correct port or the ports are blocked for outbound if imap is on a remote server.
And I noticed it appears to be a connection to gmail - so they could also have had something on their end.

 

[Sunka]

I think this is connected with this.