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Larry Franks
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adding note per customer feedback
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articles/machine-learning/how-to-secure-training-vnet.md

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@@ -243,11 +243,11 @@ When the creation process finishes, you train your model by using the cluster in
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When you enable **No public IP**, your compute cluster doesn't use a public IP for communication with any dependencies. Instead, it communicates solely within the virtual network using Azure Private Link ecosystem and service/private endpoints, eliminating the need for a public IP entirely. No public IP removes access and discoverability of compute cluster nodes from the internet thus eliminating a significant threat vector. **No public IP** clusters help comply with no public IP policies many enterprises have.
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> [!WARNING]
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> By default, you do not have public internet access from No Public IP Compute Cluster. This prevents access to required resources such as Azure Active Directory, Azure Resource Manager, and others as listed in the [Required public internet access](#required-public-internet-access) section. Or to non-Microsoft resources such as Pypi or Conda repositories. To resolve this problem, you need to configure User Defined Routing (UDR) to reach to a public IP to access the internet. For example, you can use a public IP of your firewall, or you can use [Virtual Network NAT](../virtual-network/nat-gateway/nat-overview.md) with a public IP.
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A compute cluster with **No public IP** enabled has **no inbound communication requirements** from public internet. Specifically, neither inbound NSG rule (`BatchNodeManagement`, `AzureMachineLearning`) is required. You still need to allow inbound from source of **VirtualNetwork** and any port source, to destination of **VirtualNetwork**, and destination port of **29876, 29877** and inbound from source **AzureLoadBalancer** and any port source to destination **VirtualNetwork** and port **44224** destination.
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> [!WARNING]
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> By default, you do not have public internet access from No Public IP Compute Cluster. This prevents *outbound* access to required resources such as Azure Active Directory, Azure Resource Manager, and other outbound resources as listed in the [Required public internet access](#required-public-internet-access) section. Or to non-Microsoft resources such as Pypi or Conda repositories. To resolve this problem, you need to configure User Defined Routing (UDR) to reach to a public IP to access the internet. For example, you can use a public IP of your firewall, or you can use [Virtual Network NAT](../virtual-network/nat-gateway/nat-overview.md) with a public IP.
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**No public IP** clusters are dependent on [Azure Private Link](how-to-configure-private-link.md) for Azure Machine Learning workspace.
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A compute cluster with **No public IP** also requires you to disable private endpoint network policies and private link service network policies. These requirements come from Azure private link service and private endpoints and aren't Azure Machine Learning specific. Follow instruction from [Disable network policies for Private Link service](../private-link/disable-private-link-service-network-policy.md) to set the parameters `disable-private-endpoint-network-policies` and `disable-private-link-service-network-policies` on the virtual network subnet.
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