Is it possible to connect SQL Server via internet without opening port

@Dong When you procure a database from your service provider, you have to choose the space to allocate the DB with db name and to access that they provide a static IP for connection. In your connection string just you have to ser the server: IP and rest connection string accordingly. Rest their panel will take care of all the stuff. I had already used in my earlier projects. Aside your question, the transport layer of the OSI architecture acquires tcp and udp ports for communication. If you navigate to the settings of teamviewer, you will find the tcp and udp ports. If you needs any clarification, do let us know

You do not understand my question, The Microsoft standard SQL Server connection must have a static IP, a Port, a user and a password to connect via the Internet, this connection is like the connection of VNC software to control the computer from Meanwhile, teamView and Ultraview software have the same function as VNC software only uses IP, user and password to connect, you should note that teamView and UltraView software do not use a port to connect, in In this case, I want to ask, can I design or write code to connect SQL Server without a port like teamView or Ultraview software ?

To enter and exists in a different room there is a door, right? In the same way to connect between 2 systems there is a port to communicate. Moreover, softwares like TeamViewer uses TCP and UDP connection to communicate between them. You need a static IP from your service provider to get connected to db, in some case you have to configure it. https://www.bilbeo.com/connect-sql-server