Disable public network access on Data Explorer clusters

Security · Data Explorer · Rule · 2025_12 · Critical

Azure Data Explorer (ADX) clusters should have public network access disabled.

Description

Disabling public network access improves security by ensuring that the cluster isn't exposed on the public internet. You can control exposure of your clusters by creating private endpoints instead.

Recommendation

Consider disabling public network access on Azure Data Explorer clusters, using private endpoints to control connectivity.

Examples

Configure with Azure template

To deploy Data Explorer clusters that pass this rule:

• Set the properties.publicNetworkAccess property to Disabled.

For example:

Azure Template snippet

{
  "type": "Microsoft.Kusto/clusters",
  "apiVersion": "2024-04-13",
  "name": "[parameters('name')]",
  "location": "[parameters('location')]",
  "sku": {
    "name": "Standard_D11_v2",
    "tier": "Standard"
  },
  "identity": {
    "type": "SystemAssigned"
  },
  "properties": {
    "enableDiskEncryption": true,
    "publicNetworkAccess": "Disabled"
  }
}

Configure with Bicep

To deploy Data Explorer clusters that pass this rule:

• Set the properties.publicNetworkAccess property to Disabled.

For example:

Azure Bicep snippet

resource adx 'Microsoft.Kusto/clusters@2024-04-13' = {
  name: name
  location: location
  sku: {
    name: 'Standard_D11_v2'
    tier: 'Standard'
  }
  identity: {
    type: 'SystemAssigned'
  }
  properties: {
    enableDiskEncryption: true
    publicNetworkAccess: 'Disabled'
  }
}

Links

• SE:06 Network controls
• Security: Level 4
• Restrict public access to your Azure Data Explorer cluster
• Azure security baseline for Azure Data Explorer
• NS-2: Secure cloud services with network controls
• Azure deployment reference

Comments