If you have a low-bandwidth network connection or a high-latency network connection between Microsoft Dynamics CRM 4.0 client for Outlook and the Microsoft Dynamics CRM 4.0 server, you receive the following error message when you try to go online :
An unknown error has occurred. Retry the action. If the problem persists, contact your system administrator.
Additionally, when you run a platform trace in the Microsoft Dynamics CRM 4.0 client for Outlook, the following error message appears in the platform trace:
Exception occurred in playback of SOAP packet System.Net.WebException: The operation has timed out
at Microsoft.Crm.Application.Outlook.SyncQueue.SyncQueueDriver.ProcessSoapPacket(OfflineQueueRow row, SoapPacketModifier packetModifier)
at SyncQueueDriver.ProcessSoapPacket(OfflineQueueRow row, SoapPacketModifier packetModifier) at SyncQueueDriver.DoGoOnline()
at SyncQueueDriver.GoOnline() at SyncQueueForOutlook.DoGoOnline() at ThreadHelper.ThreadStart_Context(Object state)
at ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state) at ThreadHelper.ThreadStart()
This problem occurs if you added some large attachments to an e-mail message when you were offline.