property Port: Integer;
A socket is a combination of an IP address and port number. You can control the ASTA server port by assigning this property. You can assign port numbers above 2048. The AstaServerSocket defaults to port 9000. If you change to Port 5555, then you will need to make sure that your AstaClientSocket.Port property is assigned 5555.
For more information, see AstaClientSocket.Port