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Title
An existing connection was forcibly closed by the remote host - error in Console or Mage.log. -
Description
The error below is recorded:
An existing connection was forcibly closed by the remote host
The error may be present in both the Console and Mage.log.
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Cause
Processing of batches larger sized individual emails can contribute to this error. -
Resolution
Where large individual mail items are suspected or confirmed reducing the MaxItemCountPerBatchUploadToExchange (detailed in https://support.quest.com/technical-documents/migration-manager-for-exchange/8.14/user-guide/22#TOPIC-529190) can positively help clear the error.
The default setting is 32, reducing this initially to 16, re-sync the mailbox/s and monitor the progress of the sync.
Further adjustments downward may be required dependent on the amount of large emails required to process.