Azure ATP Sizing Tool "Tool failed to start working with this machine"

[Mathieu Aït Azzouzène]

Hi all,

I launched the Azure ATP sizing tool in my client environment but I get a "Tool failed to start working with this machine" on  3 DCs. Those DCs are recent and hosted in Azure.

I can't find any prerequisites within the Azure ATP Sizing Tool documentation, do you know what could be wrong?

Thank you

[#2]

Probably one or more ports are blocked.

See the description paragraph at

https://gallery.technet.microsoft.com/Azure-Advanced-Threat-a11343c4

for which ports are used and how.