[horde] ActiveSync syncs single messages countlessly

Michael J Rubinsky mrubinsk at horde.org
Sun Sep 27 20:50:03 UTC 2015 

Quoting Jens Hellermann <hellermann at we-do.com>:

> Am 21.09.2015 um 16:53 schrieb Michael J Rubinsky:
>>
>> Quoting Jens Hellermann <hellermann at we-do.com>:
>>
>>> Am 16.09.2015 um 14:16 schrieb Michael J Rubinsky:
>>>>
>>>> Quoting Jens Hellermann <hellermann at we-do.com>:
>>>>
>>>>> Am 15.09.2015 um 17:26 schrieb Michael J Rubinsky:
>>>>>>
>>>>>> Quoting Jens Hellermann <hellermann at we-do.com>:
>>>>>>
>>>>>>> Dear Horde List members,
>>>>>>>
>>>>>>> I still have problems syncing a very large email account via  
>>>>>>> activesync to an Outlook 2013 client. The imap account shows  
>>>>>>> 54.517 email entries in Horde Webmail.
>>>>>>>
>>>>>>> To a certain point the sync seems to work normally, but after  
>>>>>>> hours Outlook starts repeatedly to fetch the same message  
>>>>>>> again and again.  (Approximatly a 100 times)
>>>>>>>
>>>>>>> Then it goes over to the next message and does the very same  
>>>>>>> thing again. Something in the communication between Outlook  
>>>>>>> and horde seems to go wrong.
>>>>>>>
>>>>>>> Has anyone ever heard of a similar problem? I'm going to do  
>>>>>>> some extra research tomorrow, but its difficult to go through  
>>>>>>> the log file as it is extremely large.
>>>>>>
>>>>>> This *usually* means that there is some issue with that  
>>>>>> specific email. Try to find the spot in the log where that  
>>>>>> email is first requested and sent to the client and post the  
>>>>>> log with some context before and after that request.
>>>>>>
>>>>> Hello Michael,
>>>>>
>>>>> here is one example for a mail that has been fetched very often.  
>>>>> Here come the parts of the log when it turns up the first and  
>>>>> the second time. As you can see, the next mail in the log is  
>>>>> also getting fetched a second time.
>>>>>
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Updating state during change
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Peak memory usage after  
>>>>> message: 68419584
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965]  
>>>>> Horde_Core_ActiveSync_Driver::getMessage(INBOX, 19429)
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Sending MIME Message.
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Checking MIMETRUNCATION:  
>>>>> , ServerData: 33875
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Fetching verb for  
>>>>> <9E9BE3F2-C32E-4759-96BE-E89CA76E8B9D at we-do.eu>.
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O      <Add>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <ServerEntryId>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O        19429
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </ServerEntryId>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O       <Data>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O marschall at nexus-netsoft.com
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Cc>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         [171 bytes of content]
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Cc>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:From>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.eu>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:From>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Subject>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Re: UBSKM:  
>>>>> Hilfeportal ▒^▒bernahme - offene Fragen
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Subject>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Reply-To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.eu>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Reply-To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:DateReceived>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O 2015-01-13T15:46:15.000Z
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:DateReceived>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:DisplayTo>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Ricardo Marschall
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:DisplayTo>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:ThreadTopic>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Re: UBSKM:  
>>>>> Hilfeportal ▒^▒bernahme - offene Fragen
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:ThreadTopic>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Importance>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         1
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Importance>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Read>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         1
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Read>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:MessageClass>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         IPM.Note
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:MessageClass>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:InternetCPID>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         65001
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:InternetCPID>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:NativeBodyType>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         2
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </AirSyncBase:NativeBodyType>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:Body>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:Type>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O          4
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </AirSyncBase:Type>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:EstimatedDataSize>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O          33875
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O  
>>>>> </AirSyncBase:EstimatedDataSize>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:Truncated>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O          0
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </AirSyncBase:Truncated>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <AirSyncBase:Data>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O          [STREAM]
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </AirSyncBase:Data>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </AirSyncBase:Body>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Flag/>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:ContentClass>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O urn:content-classes:message
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:ContentClass>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Categories/>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </Data>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O      </Add>
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Updating state during change
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Peak memory usage after  
>>>>> message: 68419584
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965]  
>>>>> Horde_Core_ActiveSync_Driver::getMessage(INBOX, 19431)
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Sending MIME Message.
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Checking MIMETRUNCATION:  
>>>>> , ServerData: 21084
>>>>> 2015-09-08T15:15:36+02:00 INFO: [1965] Fetching verb for  
>>>>> <8ADBA7D7-3910-401B-B0A7-26E70B5B8761 at we-do.com>.
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O      <Add>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <ServerEntryId>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O        19431
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </ServerEntryId>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O       <Data>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         [52 bytes of content]
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:To>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Cc>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         [85 bytes of content]
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:Cc>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:From>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.com>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O </POOMMAIL:From>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O <POOMMAIL:Subject>
>>>>> 2015-09-08T15:15:36+02:00 DEBUG: [1965] O         Auth-Codes +  
>>>>> SSL Zertifikat für Domains
>>>>>
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Updating state during change
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Peak memory usage after  
>>>>> message: 68681728
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968]  
>>>>> Horde_Core_ActiveSync_Driver::getMessage(INBOX, 19429)
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Sending MIME Message.
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Checking MIMETRUNCATION:  
>>>>> , ServerData: 33875
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Fetching verb for  
>>>>> <9E9BE3F2-C32E-4759-96BE-E89CA76E8B9D at we-do.eu>.
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O      <Add>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <ServerEntryId>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O        19429
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </ServerEntryId>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O       <Data>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O marschall at nexus-netsoft.com
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Cc>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         [171 bytes of content]
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Cc>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:From>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.eu>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:From>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Subject>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Re: UBSKM:  
>>>>> Hilfeportal ▒^▒bernahme - offene Fragen
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Subject>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Reply-To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.eu>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Reply-To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:DateReceived>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O 2015-01-13T15:46:15.000Z
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:DateReceived>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:DisplayTo>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Ricardo Marschall
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:DisplayTo>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:ThreadTopic>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Re: UBSKM:  
>>>>> Hilfeportal ▒^▒bernahme - offene Fragen
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:ThreadTopic>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Importance>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         1
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Importance>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Read>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         1
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Read>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:MessageClass>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         IPM.Note
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:MessageClass>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:InternetCPID>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         65001
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:InternetCPID>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:NativeBodyType>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         2
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </AirSyncBase:NativeBodyType>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:Body>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:Type>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O          4
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </AirSyncBase:Type>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:EstimatedDataSize>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O          33875
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O  
>>>>> </AirSyncBase:EstimatedDataSize>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:Truncated>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O          0
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </AirSyncBase:Truncated>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <AirSyncBase:Data>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O          [STREAM]
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </AirSyncBase:Data>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </AirSyncBase:Body>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Flag/>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:ContentClass>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O urn:content-classes:message
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:ContentClass>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Categories/>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </Data>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O      </Add>
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Updating state during change
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Peak memory usage after  
>>>>> message: 68681728
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968]  
>>>>> Horde_Core_ActiveSync_Driver::getMessage(INBOX, 19431)
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Sending MIME Message.
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Checking MIMETRUNCATION:  
>>>>> , ServerData: 21084
>>>>> 2015-09-08T15:58:17+02:00 INFO: [1968] Fetching verb for  
>>>>> <8ADBA7D7-3910-401B-B0A7-26E70B5B8761 at we-do.com>.
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O      <Add>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <ServerEntryId>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O        19431
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </ServerEntryId>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O       <Data>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         [52 bytes of content]
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:To>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Cc>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         [85 bytes of content]
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:Cc>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:From>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Christoph  
>>>>> Franz - WE DO <franz at we-do.com>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O </POOMMAIL:From>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O <POOMMAIL:Subject>
>>>>> 2015-09-08T15:58:17+02:00 DEBUG: [1968] O         Auth-Codes +  
>>>>> SSL Zertifikat für Domains
>>>>
>>>> That's not enough of the log to determine anything. I need the  
>>>> entire request and response. Of at least two instances of this  
>>>> happening. Preferably the first one, and the second one.
>>>>
>>>> Requests like this rarely contain only a single email message, so  
>>>> it's not unusual that multiple messages are synchronized each  
>>>> time. If a single error occurs with any of the messages in a  
>>>> specific request (identified by a synckey), depending on the  
>>>> error, the client makes the same request again, which results in  
>>>> the same response, until the client gives up.
>>>>
>>>>
>>>
>>> Hello Michael, I answered directly to your account with a  
>>> downloadlink to the shortend logfile as there is to much  
>>> information involved for publishing it here.
>>
>> Sorry, but the file you provided still only shows a single  
>> request/response (along with some other, unrelated requests).
> Hmm, I'm sorry indeed, I'm not familiar with the request structure.  
> I'll provide you with the full log split in three parts. I'll send  
> you the download links via your direct email Adress again.


2015-09-16T21:23:33+02:00 ERR: Attribute "DTEND" Not Found


This is your problem. One of your meeting requests/responses contains  
no end date/time. This is not required, but there was a small bug that  
caused an exception to be thrown when this was encountered.

This was fixed in the recently released Horde_ActiveSync package, you  
need to update.

-- 
mike
The Horde Project
http://www.horde.org
https://www.facebook.com/hordeproject
https://www.twitter.com/hordeproject
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