Configuring firewall rules
Each SQL Server instance running on your server is using a different port number to listen for incoming connections, but during the installation of the SQL Server, there are no firewall rules created on your local firewall. So SQL Server is perfectly accessible locally, but not from remote hosts if the local firewall is active. You can run with a built-in firewall on the Windows Servers or have some third-party software in your environment, which requires additional configuration.
During the installation of the SQL Server, you had to make a choice between deploying SQL Server as a default instance or a named instance. SQL Server default instance is listening on port 1433, which you can verify in the SQL Server configuration ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Read now
Unlock full access