What does it say on the DeviceInfo related to the scan? That will tell you what it used to access the machine.
Yes Andrew it says the same Windows AD proxy which I have mentioned above in credential test.
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Most of those ports need to be accessible from the Windows machine running the Windows proxy rather than the appliance. 135 needs to be accessible from the appliance if it has not previously seen the machine as Windows and remembered last access to try on the next scan. Otherwise the appliance will just ask the same proxy pool to access the machine again on the next scan.