Configuring Azure SQL Firewall Rules

By Tom Nonmacher

Azure SQL Server, a fully managed relational database service from Microsoft Azure, provides a broad range of SQL Server functionalities on the cloud. One of the fundamental aspects of managing your Azure SQL Server instance is setting up firewall rules. These rules allow you to specify the IP addresses that can access your Azure SQL Server. In this blog post, we will guide you through the steps of configuring Azure SQL Firewall rules.

Firstly, you need to log into your Azure portal and navigate to your Azure SQL Server instance. Once there, select "Firewall" from the left-hand menu. Here you can add your client IP, which is the IP address of the computer you're using to access Azure SQL Server. It's worth noting that Azure automatically detects and displays your client IP address, making it easy to add.

To add a new firewall rule, you need to provide a rule name, start IP, and end IP. The rule name is a unique identifier for the rule, and the start and end IPs define the range of IP addresses that can access the Azure SQL Server. After entering these details, click on "Add client IP" and then "Save" to add the rule.

You can also manage Azure SQL Firewall rules using T-SQL commands. Here's an example of how to create a new firewall rule using T-SQL: 


-- T-SQL code to create a new firewall rule
EXECUTE sp_set_firewall_rule N'My Firewall Rule',
'0.0.0.0', '0.0.0.0';

This command creates a new firewall rule named "My Firewall Rule" that allows access from all IP addresses. The two '0.0.0.0' entries represent the start and end of the IP address range.

There are also T-SQL commands you can use to delete and modify existing firewall rules. For example, to delete a firewall rule, you can use the following command: 


-- T-SQL code to delete a firewall rule
EXECUTE sp_delete_firewall_rule N'My Firewall Rule';

In this command, replace "My Firewall Rule" with the name of the firewall rule you want to delete.

In conclusion, Azure SQL Server Firewall rules are an essential aspect of managing your Azure SQL Server instance. They provide a layer of security by allowing you to specify the IP addresses that can access your server. Remember, you can manage these rules through the Azure portal or by using T-SQL commands.

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