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

Restrictive Access to SQL Server Instance: Limiting Connections to Specified IP Addresses

Restricting access to your SQL Server instance to specific IP addresses is a crucial security measure to prevent unauthorized connections. The question posed seeks guidance on configuring this restriction either at the instance or database level.

Answer: Configuring Access Restrictions

The most effective approach to restrict access is to use the Windows firewall. By blocking the SQL Server port(s) and allowing exceptions for specific IP addresses, you can establish a secure access framework.

Alternatively, a less desirable option is to implement a logon trigger. This trigger would verify the IP address of the incoming connection against the sys.dm_exec_connections system view. However, this approach is not as robust as the firewall method.

Limitations at the Database Level

Configuring access restrictions at the database level is challenging. SQL Server lacks built-in mechanisms to enforce IP-based restrictions at that level. Therefore, utilizing the Windows firewall or a logon trigger remains the preferred approach to restrict connections to your SQL Server instance.

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