I now get the following log.
I can't understand what the error refers to:
Dec 08 18:10:55 sogod [5520]: <0x0x7fd661d4b410[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Sync xmlns="AirSync:">
<Collections>
<Collection>
<SyncKey>14071-42508</SyncKey>
<CollectionId>mail%2F7b417b2407e93d589f6200001cd075c0</CollectionId>
<GetChanges/>
<WindowSize>25</WindowSize>
<Options>
<FilterType>5</FilterType>
<MIMETruncation>1</MIMETruncation>
<MIMESupport>0</MIMESupport>
<BodyPreference xmlns="AirSyncBase:">
<Type>1</Type>
<TruncationSize>500</TruncationSize>
</BodyPreference>
</Options>
</Collection>
</Collections>
</Sync>
Dec 08 18:10:56 sogod [5520]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Sync HTTP/1.0" 200 0/108 0.465 - - -436K
Dec 08 18:10:57 sogod [5520]: <0x0x7fd661e1e460[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Sync xmlns="AirSync:">
<Collections>
<Collection>
<SyncKey>-1</SyncKey>
<CollectionId>vcard%2F2C0B-583DFF00-1-2E63B8C0</CollectionId>
<GetChanges/>
<WindowSize>25</WindowSize>
<Options>
<BodyPreference xmlns="AirSyncBase:">
<Type>1</Type>
<TruncationSize>32768</TruncationSize>
</BodyPreference>
</Options>
</Collection>
</Collections>
</Sync>
Dec 08 18:10:57 sogod [5520]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Sync HTTP/1.0" 200 0/79 0.008 - - 0
Dec 08 18:10:57 sogod [5520]: <0x0x7fd661cb8f00[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Sync xmlns="AirSync:">
<Collections>
<Collection>
<SyncKey>1481130326</SyncKey>
<CollectionId>vcard%2Fpersonal</CollectionId>
<GetChanges/>
<WindowSize>25</WindowSize>
<Options>
<BodyPreference xmlns="AirSyncBase:">
<Type>1</Type>
<TruncationSize>32768</TruncationSize>
</BodyPreference>
</Options>
</Collection>
</Collections>
</Sync>
Dec 08 18:10:58 sogod [5520]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Sync HTTP/1.0" 200 0/71 0.063 - - 0
Dec 08 18:10:58 sogod [5520]: <0x0x7fd661679560[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Sync xmlns="AirSync:">
<Collections>
<Collection>
<SyncKey>-1</SyncKey>
<CollectionId>vcard%2Fadmin_A_yna11_D_com_67E7-583DF300-1-70BC4580</CollectionId>
<GetChanges/>
<WindowSize>25</WindowSize>
<Options>
<BodyPreference xmlns="AirSyncBase:">
<Type>1</Type>
<TruncationSize>32768</TruncationSize>
</BodyPreference>
</Options>
</Collection>
</Collections>
</Sync>
Dec 08 18:10:58 sogod [5520]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Sync HTTP/1.0" 200 0/99 0.020 - - 0
Dec 08 18:10:58 sogod [5520]: <0x0x7fd661d0ea70[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<FolderSync xmlns="FolderHierarchy:">
<SyncKey>server_example_com_1468_1df42a35_0</SyncKey>
</FolderSync>
Dec 08 18:10:58 sogod [5520]: <0x0x7fd661d0ea70[SOGoActiveSyncDispatcher]> EAS - response for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<FolderSync xmlns="FolderHierarchy:">
<Status>1</Status>
<SyncKey>server_example_com_1468_1df42a35_0</SyncKey>
<Changes>
<Count>0</Count>
</Changes>
</FolderSync>
Dec 08 18:10:58 sogod [5520]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=FolderSync HTTP/1.0" 200 57/45 0.398 - - 4K
Dec 08 18:11:01 sogod [5520]: <0x0x7fd661a6fe60[SOGoActiveSyncDispatcher]> EAS - Empty Ping request - using cached HeatbeatInterval (3540)
Dec 08 18:11:01 sogod [5520]: <0x0x7fd661a6fe60[SOGoActiveSyncDispatcher]> EAS - Empty Ping request - using cached folders ("vevent%2Fadmin_A_example_D_com_6725-583DF200-1-61F5C900", "vcard%2F2C0B-583DFF00-1-2E63B8C0", "vtodo%2Fadmin_A_example_D_com_670C-583DF200-1-4FD0E300", "mail%2F7e417b2407e93d589f6200001cd075c0", "vevent%2F2D7B-583DFF80-1-6044390", "vcard%2Fadmin_A_example_D_com_67E7-583DF300-1-70BC4580", "vevent%2Fadmin_A_example_D_com_670C-583DF200-1-4FD0E300", "vtodo%2Fpersonal", "vtodo%2Fadmin_A_example_D_com_6718-583DF200-1-5CAA2B00", "vtodo%2Fadmin_A_example_D_com_6725-583DF200-1-61F5C900", "mail%2F7b417b2407e93d589f6200001cd075c0", "vevent%2Fpersonal", "vevent%2Fadmin_A_example_D_com_6718-583DF200-1-5CAA2B00", "vtodo%2F2DFF-583E0000-1-EB467E0", "vcard%2Fpersonal")
Dec 08 18:11:01 sogod [5520]: <0x0x7fd661a6fe60[SOGoActiveSyncDispatcher]> Sleeping 30 seconds while detecting changes in Ping...
Dec 08 18:11:04 sogod [5510]: [WARN] <0x0x7fd66193ddc0[WOWatchDogChild]> pid 5519 has been hanging in the same request for 9 minutes
Dec 08 18:11:04 sogod [5510]: [WARN] <0x0x7fd66193da50[WOWatchDogChild]> pid 5518 has been hanging in the same request for 4 minutes
Dec 08 18:11:05 sogod [5511]: <0x0x7fd661d066f0[SOGoActiveSyncDispatcher]> EAS - request for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Sync xmlns="AirSync:">
<Collections>
<Collection>
<SyncKey>17306-54901</SyncKey>
<CollectionId>mail%2F7e417b2407e93d589f6200001cd075c0</CollectionId>
<GetChanges/>
<WindowSize>25</WindowSize>
<Options>
<FilterType>5</FilterType>
<MIMETruncation>1</MIMETruncation>
<MIMESupport>0</MIMESupport>
<BodyPreference xmlns="AirSyncBase:">
<Type>1</Type>
<TruncationSize>500</TruncationSize>
</BodyPreference>
</Options>
</Collection>
</Collections>
</Sync>
Dec 08 18:11:05 sogod [5511]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Sync HTTP/1.0" 200 0/108 0.425 - - 0
Dec 08 18:11:06 sogod [5518]: <0x0x7fd661abc700[SOGoActiveSyncDispatcher]> Sleeping 30 seconds while detecting changes in Ping...
Dec 08 18:11:07 sogod [5511]: <0x0x7fd6616a6470[SOGoActiveSyncDispatcher]> EAS - Empty Ping request - using cached HeatbeatInterval (3540)
Dec 08 18:11:07 sogod [5511]: <0x0x7fd6616a6470[SOGoActiveSyncDispatcher]> EAS - Empty Ping request - using cached folders ("vevent%2Fadmin_A_example_D_com_6725-583DF200-1-61F5C900", "vcard%2F2C0B-583DFF00-1-2E63B8C0", "vtodo%2Fadmin_A_example_D_com_670C-583DF200-1-4FD0E300", "mail%2F7e417b2407e93d589f6200001cd075c0", "vevent%2F2D7B-583DFF80-1-6044390", "vcard%2Fadmin_A_example_D_com_67E7-583DF300-1-70BC4580", "vevent%2Fadmin_A_example_D_com_670C-583DF200-1-4FD0E300", "vtodo%2Fpersonal", "vtodo%2Fadmin_A_example_D_com_6718-583DF200-1-5CAA2B00", "vtodo%2Fadmin_A_example_D_com_6725-583DF200-1-61F5C900", "mail%2F7b417b2407e93d589f6200001cd075c0", "vevent%2Fpersonal", "vevent%2Fadmin_A_example_D_com_6718-583DF200-1-5CAA2B00", "vtodo%2F2DFF-583E0000-1-EB467E0", "vcard%2Fpersonal")
Dec 08 18:11:08 sogod [5511]: <0x0x7fd6616a6470[SOGoActiveSyncDispatcher]> Sleeping 30 seconds while detecting changes in Ping...
Dec 08 18:11:08 sogod [5519]: <0x0x7fd661d38140[SOGoActiveSyncDispatcher]> EAS - Ping request canceled (5511)
Dec 08 18:11:08 sogod [5519]: <0x0x7fd661d38140[SOGoActiveSyncDispatcher]> EAS - response for device XXXXXXXXXXXXXXXXXXXXXXXXXX: <?xml version="1.0"?>
<!DOCTYPE ActiveSync PUBLIC "-//MICROSOFT//DTD ActiveSync//EN" "http://www.microsoft.com/">
<Ping xmlns="Ping:">
<Status>1</Status>
</Ping>
Dec 08 18:11:08 sogod [5519]: [ERROR] <0x0x7fd661d732c0[WOHttpTransaction]> client disconnected during delivery of response for <WORequest[0x0x7fd6616bb980]: method=POST uri=/SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Ping app=SOGo rqKey=Microsoft-Server-ActiveSync rqPath=(null)> (len=13): the socket was shutdown
Dec 08 18:11:08 sogod [5519]: localhost.localdomain "POST /SOGo/Microsoft-Server-ActiveSync?User=user@example.com&DeviceId=XXXXXXXXXXXXXXXXXXXXXXXXXX&DeviceType=iPhone&Cmd=Ping HTTP/1.0" 200 13/0 544.391 - - 1M