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We are having some troubles with our Kerio Connect server lately.
The server is running Kerio Connect 7.3.2 build 6388 .

Multiple domains are being hosted on this server and we only encounter the problem on one of them.
The users from this particular domain are using a shared contact list in the public folders.
Normally this list contains about 1000-1500 contacts, however we can see it is now constantly growing. Currently we are at 119813 contacts. After investigating it seems that it is constantly inserting duplicate entries (the whole list is being duplicated over and over again).

I believe the contacts are being inserted by a client program since we can see a serious rise in HTTP connections in the past days (although this could be the clients pulling down the duplicate entries).

The users on this domain use multiple devices, most of the use the Kerio Offline Connection, however there are some android and ipad devices that are being synced. We've tried using the debug log to find out what was duplicating the contacts but we had no success there (either we didn't specify the correct options, or it is just not there).
We've also tried re-indexing the public folders, which didn't solve the problem.

Manually checking the settings on all devices is virtually impossible, since there are a lot of devices in different locations.
The disk utilization of the server is at 100%, so some functions of the Administrative Interface are starting to become impacted (for example, looking up the mobile devices of a client).

Is there any way in which we can detect which device is responsible for the duplicate entries and block it?

Kind regards,


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Update: at the moment the issue seems to be originating from one specific user account.
This account syncs the contacts using Kerio Offline Connector, iPad (ActiveSync 12.1) and NotifySync (ActiveSync 12.0). The problem is probably located on the ActiveSync devices.
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