This task is part of the main task of Configuring TCP/IP communications for a DB2® instance.
The TCP/IP services file specifies the ports that server applications can listen on for client requests. If you specified a service name in the svcename field of the DBM configuration file, the services file must be updated with the service name to port number/protocol mapping. If you specified a port number in the svcename field of the DBM configuration file, the services file does not need to be updated.
db2c_db2inst1 3700/tcp # DB2 connection service port
where: