The server configures the database manager environment to use the indicated port for connections from the server. Initially, connections from the server do not use TCP/IP. After the number of connections exceeds a pre-determined threshold, connections are made through TCP/IP to the specified port. If the port is being used by another application, the database manager cannot receive connections from the server after the change to TCP/IP connections is necessary. After this situation occurs, future connections to the database manager might fail.