In an App Service Environment, achieving private connectivity and traffic control is essential for securing PaaS workloads. Through service endpoints and private endpoints, you can restrict access to Azure resources solely to your designated virtual networks. Service endpoints let Azure services recognize the identity of your VNet and switch outbound traffic from public IPv4 to private IPv4 addresses on the Microsoft backbone. Private endpoints, powered by Azure Private Link, assign a private IP within your VNet, bringing the service directly into your network and eliminating public exposure.
Configuring service endpoints begins by enabling them on the App Service subnet. After deployment, note that connections reset when the source IP switches from public to private, and DNS entries still resolve to public IP addresses. To control outbound traffic, you must use service tags in NSG rules to allow traffic only to specific Azure services, as their IP ranges are dynamic.
For deeper isolation, implement private endpoints to provide a network interface with a private IP address in your VNet. This ensures all inbound traffic remains within the Azure backbone and removes the need for public IPs for the service. While inbound traffic is secured via the private endpoint, outbound traffic from your app continues over the App Service infrastructure using virtual network integration.
To enforce precise traffic control, apply Network Security Groups (NSGs) on the App Service subnet using a deny by default, permit by exception model. For advanced outbound control, you can force traffic through an Azure Firewall virtual appliance using a user-defined route and create application rules to allow only approved FQDN destinations. Finally, validate your configuration using Azure Network Watcher and monitor traffic with Firewall diagnostics logs for troubleshooting and security posture assessment.
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Service endpoints switch outbound traffic from a public IPv4 to a private IPv4 address on the Microsoft backbone, while private endpoints assign a private IP address within your virtual network, bringing the service directly into your network and eliminating its public exposure.
You can control outbound traffic by using service tags in Network Security Group (NSG) rules to allow traffic only to specific Azure services, or by forcing traffic through an Azure Firewall virtual appliance using a user-defined route and creating application rules for approved FQDN destinations.
You can validate your configuration using Azure Network Watcher and monitor traffic with Azure Firewall diagnostics logs for troubleshooting and security posture assessment.
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