[BitBucket user: Sébastien Jodogne]
[BitBucket date: 2018-03-18.11:28:53]

This is not a bug in Orthanc, but a configuration issue on your side.  Please carefully read the documentation, and use the dedicated discussion forum.

http://book.orthanc-server.com/faq/query-retrieve.html

https://groups.google.com/forum/#!forum/orthanc-users