Azure Private Endpoints: Eliminating Public PaaS Exposure for Berlin Businesses

Azure Private Endpoints assign a private IP address from your virtual network to Azure PaaS services — including Azure Storage, Azure Key Vault, Azure SQL Database, Azure Service Bus, and dozens more — routing all traffic over the Microsoft backbone network rather than the public internet. For Berlin small businesses running workloads in Azure, Private Endpoints eliminate the primary attack surface for PaaS services: internet-accessible public endpoints that can be targeted by credential stuffing, brute force, or misconfiguration exploitation. Once a Private Endpoint is deployed and the public network access is disabled, the service is unreachable from the internet entirely.

How Private Endpoints Work

A Private Endpoint creates a network interface in your VNet with a private IP address that maps to a specific Azure service instance. DNS resolution for the service’s public FQDN (e.g., mystorageaccount.blob.core.windows.net) is overridden — either via Azure Private DNS Zones automatically or manually via custom DNS — to return the private IP address rather than the public endpoint IP. Applications connecting to the service continue using the same connection strings with no code changes required; only the resolved IP address changes from public to private.

After creating a Private Endpoint, you should disable public network access on the target resource — setting the storage account, Key Vault, or SQL database to reject all connections not originating from a Private Endpoint. This is the critical step that eliminates internet exposure; creating a Private Endpoint alone without disabling public access adds a private path but doesn’t remove the public one.

Private Endpoints for Azure Key Vault

Azure Key Vault is one of the most important resources to protect with a Private Endpoint: it stores secrets, encryption keys, and certificates used by applications and infrastructure. A Key Vault accessible over the internet is a high-value target — successful authentication with stolen credentials or exploitation of a misconfigured access policy could expose all stored secrets. Deploying a Private Endpoint for Key Vault and disabling public access ensures that secrets are only retrievable from within your VNet or from hybrid-connected on-premises networks, not from arbitrary internet sources.

Private Endpoints for Storage Accounts

Storage accounts used for application data, backup, or logging are frequently misconfigured with overly permissive public access. Microsoft Defender for Storage and EASM regularly detect publicly accessible storage containers as high-severity findings. Deploying Private Endpoints for storage accounts and disabling public blob access eliminates the entire class of storage misconfiguration findings — the container cannot be accessed from the internet regardless of whether the container-level access settings are accidentally set to public. For each storage service (Blob, File, Queue, Table, DFS), a separate Private Endpoint can be created if needed, or a combined endpoint can cover multiple sub-resources.

DNS Configuration and Hub-Spoke Architectures

Correct DNS resolution is the most common operational challenge with Private Endpoints. Azure Private DNS Zones (e.g., privatelink.blob.core.windows.net) must be linked to every VNet from which the service needs to be accessed, including hub VNets in hub-spoke topologies. In hybrid environments using on-premises DNS servers, conditional forwarders must redirect PaaS FQDNs to the Azure DNS resolver (168.63.129.16) to ensure on-premises machines resolve to private IPs rather than public ones. Incorrect DNS configuration causes Private Endpoint traffic to fail silently or fall back to the public endpoint if public access was not disabled.

Integration with Azure Bastion and Network Security

Azure Bastion and Private Endpoints are complementary: Bastion secures the management access path to VMs (replacing internet-accessible RDP/SSH), while Private Endpoints secure the data path to PaaS services (replacing internet-accessible storage and database endpoints). Together they eliminate the two primary categories of internet-exposed attack surface in a typical Azure SMB deployment. NSG rules can further restrict which subnets can reach Private Endpoint network interfaces, adding an additional layer of micro-segmentation beyond simply disabling public access.

Implementing Private Endpoints across your Azure PaaS resources in Berlin? IT Experts Berlin deploys Private Endpoints with correct DNS configuration for hybrid environments, disables public access on target resources, and validates that all application connectivity continues to function after the network path change.