Now available – Azure Cosmos DB Network Security—New IP Firewall rule

We now support a new firewall rule that will allow you to limit access to your Azure Cosmos DB account from services deployed in Azure. Cosmos DB already supports IP based firewall rules used to limit database access to specific IP addresses, so this will offer an extra layer of security and control. Learn more about Azure Cosmos DB firewall support and this new rule.

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Source: Azure Roadmap