[BitBucket user: Alain Mazy]
[BitBucket date: 2017-07-05.21:50:58]

I have tried to configure the remote Orthanc to close the association immediately but, it still has the same effects.  The remote Orthanc realizes that the querying Orthanc is still using the previous connection and therefore, does not request to close the connection.

But I understand that your modality may not behave like Orthanc and really closes the connection after the first transfer.  I would suggest that you configure your modality to keep the connection alive a bit longer ...  however, I'll have a look at the code and at your suggestions to try to solve it without being able to reproduce ...