Print SCP works on Windows 11 but modality aborts association on Windows 7 (DUL service-user abort)

[Devendra Patil]

Environment

• OS 1: Windows 11 → Works correctly

• OS 2: Windows 7 → Association aborted

• Modality: (agfa)

What I am doing

I implemented a DICOM Print SCP using the fo-dicom Print SCP sample code from the repository.

The implementation handles:

• BasicFilmSession

• BasicFilmBox

• BasicGrayscaleImageBox

• BasicColorImageBox

When I build and run this application on Windows 11, everything works correctly:

• Modality connects successfully

• Images are received

• Print session works as expected.

Problem

When I build the same code for Windows 7 and run it:

1. Modality starts association

2. Negotiation begins

3. Then the modality aborts the session

The log shows:

DUL service-user abort

After that the association closes.

Expected Behavior

The Print SCP should behave the same on Windows 7 as on Windows 11.

Actual Behavior

Association is aborted by the modality when running on Windows 7.

Question

Is there any known compatibility issue with Windows 7 for Print SCP in fo-dicom?

Could this be related to:

• TLS / networking differences

• Presentation context negotiation

• Transfer syntax support

Any suggestions on what I should check in the association negotiation would be very helpful.