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We have are using Kerio in conjunction with JIRA to handle incoming mails to a specific inbox and user.

This mailhandler configuration has been working fine for the past 2 years, but has recently somehow completely crapped its self.

In the security log of our Kerio server we see error messages like:
IMAP connection from IP address x.x.x.x rejected: too many simultaneous connections (103 connections, limit 100)
Related to this on our JIRA server we see errors in the log like:
2017-02-02 13:45:00,112 Caesium-1-1 WARN anonymous jira @ [c.a.mail.incoming.mailfetcherservice] jira<_at_>[10100]: javax.mail.MessagingException: * BYE Too many connections from your IP address while connecting to host '<kerio host>' as user 'jira' via protocol 'imaps, caused by: com.sun.mail.iap.ConnectionException: * BYE Too many connections from your IP address

We have 13 mailhandlers configured, but somehow we have over 100 imap connections that are not being disconnected and prevent the mailhandler from working.
Also we can not log into the user account from the webmail interface.
We have tried to unlock all users from the admin interface and also disable and re enable the user account hoping this would clear all the open connections. It did not.

Any idea what could cause those zombie connections and how to get rid of them? Thanks in advance.


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I think it has to do with Apple's pushmail service!

I do not know how to solve this?
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