Can SQL Server Restrict Connections to Specific IP Addresses?

Restricting SQL Server Connections to Specified IP Addresses

Question:

Limit connections to a specific list of IP addresses on a SQL Server instance, excluding all other IP addresses. Is this configurable within SQL Server?

Answer:

While the firewall can be used to restrict SQL Server traffic by port and IP address, the implementation of such restrictions at the database level is more complex.

Using the Windows Firewall

The Windows firewall provides a straightforward solution. Block the SQL Server port(s) and create exceptions for the desired IP addresses.

Logon Trigger Approach

An alternative approach involves creating a logon trigger that checks the IP address using sys.dm_exec_connections. However, this method is less desirable than using the firewall, as it allows traffic to reach the SQL Server instance.

Database-Level Considerations

Implementing restrictions at the database level is challenging.

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