V-Suite application services communicate with the Microsoft SQL Server Database Engine via TCP. Each SQL Instance on the database server will use a different port.
The default instance of the Database Engine uses port 1433, but that can be changed. Named instances of the Database Engine use dynamic ports. That means that every time that the Database Engine starts, it identifies an available port and uses that port number. If the named instance is the only instance of the Database Engine installed, it will probably use TCP port 1433. If other instances of the Database Engine are installed, a named instance may use a different TCP port. Because the port selected might change every time that the Database Engine is started, it is difficult to configure the application services to enable access to the correct port number. It is therefore recommended to configuring a Named Instance Database Engine to use the same port number every time. This is called a fixed port or a static port. Refer to this article to configure an SQL Server instance fixed port. If the Windows Firewall on the database server is enabled you must configure an inbound rule for the database engine (either default port 1433 or custom fixed port). Refer to this article for detailed information about configuring Windows Firewall to allow SQL Server access.


The V-Suite application services which connect to SQL Server do not need to communicate with the SQL Server Browser service (UDP 1434) but if you have configured SQL Server with a specific static port, make sure when configuring the data tier to specify the port in the server name.