How Can I Restrict SQL Server Connections to Specific IP Addresses?

Restricting SQL Server Connections to Specific IP Addresses

Question:

How can I limit the connections to my SQL Server instance to a specific set of IP addresses while prohibiting access from all other sources?

Answer:

While restricting SQL Server connections based on IP addresses is not directly configurable within the SQL Server instance or database, there are several alternative approaches:

• Windows Firewall: The preferred method is to utilize the Windows firewall to block incoming connections to the SQL Server port(s) while allowing exceptions for designated IP addresses.
• Logon Trigger: An alternative, but less desirable option, involves creating a logon trigger. This trigger can verify an incoming connection's IP address using the sys.dm_exec_connections function. However, implementing this approach is significantly more complex than using the Windows firewall.
• Database-Level Restrictions: Restricting connections at the database level can be challenging, as SQL Server does not offer built-in functionality for IP address-based access control.

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