> In the client I use the port number 3050 in the connection string.
That defines the **port on the server** which will be connected to. The client side port is assigned by the OS, since there is no need to use a specific port on the client side. Also, it necessary to support a client having multiple database connection to single or multiple servers or databases. > Is FB use multiple port as the same time ? > Is there a document which explains that ? It is basic client side IP port handling.
