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

Question

Hi all,&nbsp;I launched the Azure ATP sizing tool in my client environment but I get a&nbsp;"Tool failed to start working with this machine" on&nbsp; 3 DCs. Those DCs are recent and hosted in Azure.I can't find any prerequisites within the&nbsp;Azure ATP Sizing Tool documentation, do you know what could be wrong?&nbsp;Thank you

eliofek · Answer

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.&nbsp;

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

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